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# ![@blackpenredpen Avatar](https://lunarcrush.com/gi/w:26/cr:youtube::UC_SvYP0k05UKiJ_2ndB02IA.png) @blackpenredpen blackpenredpen

blackpenredpen posts on YouTube about amzn, patreon, youtube, integration the most. They currently have XXXXXXXXX followers and XX posts still getting attention that total XXXXXX engagements in the last XX hours.

### Engagements: XXXXXX [#](/creator/youtube::UC_SvYP0k05UKiJ_2ndB02IA/interactions)
![Engagements Line Chart](https://lunarcrush.com/gi/w:600/cr:youtube::UC_SvYP0k05UKiJ_2ndB02IA/c:line/m:interactions.svg)

- X Week XXXXXX -XX%
- X Month XXXXXXX +22%
- X Months XXXXXXXXX -XX%
- X Year XXXXXXXXX +80%

### Mentions: XX [#](/creator/youtube::UC_SvYP0k05UKiJ_2ndB02IA/posts_active)
![Mentions Line Chart](https://lunarcrush.com/gi/w:600/cr:youtube::UC_SvYP0k05UKiJ_2ndB02IA/c:line/m:posts_active.svg)

- X Months XXX -XXXX%
- X Year XXX +761%

### Followers: XXXXXXXXX [#](/creator/youtube::UC_SvYP0k05UKiJ_2ndB02IA/followers)
![Followers Line Chart](https://lunarcrush.com/gi/w:600/cr:youtube::UC_SvYP0k05UKiJ_2ndB02IA/c:line/m:followers.svg)

- X Week XXXXXXXXX no change
- X Month XXXXXXXXX no change
- X Months XXXXXXXXX +1.50%
- X Year XXXXXXXXX +5.30%

### CreatorRank: XXXXXXX [#](/creator/youtube::UC_SvYP0k05UKiJ_2ndB02IA/influencer_rank)
![CreatorRank Line Chart](https://lunarcrush.com/gi/w:600/cr:youtube::UC_SvYP0k05UKiJ_2ndB02IA/c:line/m:influencer_rank.svg)

### Social Influence [#](/creator/youtube::UC_SvYP0k05UKiJ_2ndB02IA/influence)
---

**Social category influence**
[technology brands](/list/technology-brands)  XXXX% [social networks](/list/social-networks)  XXXX% [currencies](/list/currencies)  XXXX%

**Social topic influence**
[amzn](/topic/amzn) #547, [patreon](/topic/patreon) #1035, [youtube](/topic/youtube) 8.25%, [integration](/topic/integration) #128, [pi](/topic/pi) #193, [all the](/topic/all-the) #3298, [put the](/topic/put-the) 1.03%, [topics](/topic/topics) 1.03%, [ace](/topic/ace) 1.03%, [limits](/topic/limits) XXXX%

**Top accounts mentioned or mentioned by**
[@bprpcalculusbasics](/creator/undefined) [@blackpenredpenplaylistsview50sortddshelfid5](/creator/undefined) [@just](/creator/undefined) [@gmailcom](/creator/undefined) [@820](/creator/undefined) [@takureido3122](/creator/undefined) [@sohampinemath1086](/creator/undefined) [@000](/creator/undefined) [@octopuskeng](/creator/undefined) [@dennisdavisedu](/creator/undefined) [@thelesserknownmath](/creator/undefined)
### Top Social Posts [#](/creator/youtube::UC_SvYP0k05UKiJ_2ndB02IA/posts)
---
Top posts by engagements in the last XX hours

"epsilon-N definition for a limit at infinity (introduction & how to write the proof)"  
[YouTube Link](https://youtube.com/watch?v=9JMFLzHtljA) [@blackpenredpen](/creator/youtube/blackpenredpen) 2023-08-23T10:00Z 1.4M followers, 101.2K engagements


"Convert decimal degrees to degrees minutes and seconds (dms)"  
[YouTube Link](https://youtube.com/watch?v=M0AHuWJjeSo) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-02-12T05:00Z 1.4M followers, 96.9K engagements


"fast way to do partial fraction for integrals calculus X tutorial"  
[YouTube Link](https://youtube.com/watch?v=aF4o_c46VnI) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-02-28T08:24Z 1.4M followers, 167.1K engagements


"Its not joke its rigorous enough for physics 😂"  
[YouTube Link](https://youtube.com/watch?v=6JVsIwVQcpg) [@blackpenredpen](/creator/youtube/blackpenredpen) 2025-09-27T12:00Z 1.4M followers, 153.6K engagements


"Euler's Method (introduction & example)"  
[YouTube Link](https://youtube.com/watch?v=Pm_JWX6DI1I) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-10-18T16:00Z 1.4M followers, 134.5K engagements


"So you want to prove the cubic formula (from scratch)"  
[YouTube Link](https://youtube.com/watch?v=ULsPhWmqhyc) [@blackpenredpen](/creator/youtube/blackpenredpen) 2023-04-18T17:12Z 1.4M followers, 417.9K engagements


"Ultimate Trig Identity Study Guide"  
[YouTube Link](https://youtube.com/watch?v=crlbRkEZAdw) [@blackpenredpen](/creator/youtube/blackpenredpen) 2023-09-05T14:14Z 1.4M followers, 95.8K engagements


"100 series convergence tests (no food no water no stop)"  
[YouTube Link](https://youtube.com/watch?v=jTuTEcwvkP4) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-05-06T23:56Z 1.4M followers, 3.6M engagements


"integration by parts DI method VERY EASY"  
[YouTube Link](https://youtube.com/watch?v=2I-_SV8cwsw) [@blackpenredpen](/creator/youtube/blackpenredpen) 2016-02-20T09:59Z 1.4M followers, 1.8M engagements


"solve differential equation with substitution"  
[YouTube Link](https://youtube.com/watch?v=3d8j_r2L16w) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-02-14T08:35Z 1.4M followers, 157.7K engagements


"100 calculus limits (ft epsilon-delta definition and Riemann sum limits )"  
[YouTube Link](https://youtube.com/watch?v=TglD4Y6lmQk) [@blackpenredpen](/creator/youtube/blackpenredpen) 2022-08-12T15:00Z 1.4M followers, 786.6K engagements


"Laplace transform of 1"  
[YouTube Link](https://youtube.com/watch?v=nGMEGbAkTfk) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-04-11T07:06Z 1.4M followers, 112.6K engagements


"Laplace Transform: Translation Theorem in s"  
[YouTube Link](https://youtube.com/watch?v=shVLuccijfU) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-04-14T03:13Z 1.4M followers, 46.4K engagements


"how Laplace solved the Gaussian integral"  
[YouTube Link](https://youtube.com/watch?v=tCPQSobqFh4) [@blackpenredpen](/creator/youtube/blackpenredpen) 2022-10-24T19:08Z 1.4M followers, 850.7K engagements


"Solving polynomial equations but they get increasingly awesome"  
[YouTube Link](https://youtube.com/watch?v=-EDdRZcgLa4) [@blackpenredpen](/creator/youtube/blackpenredpen) 2022-06-01T11:00Z 1.4M followers, 1.3M engagements


"how to easily write the epsilon-delta proofs for limits"  
[YouTube Link](https://youtube.com/watch?v=4pRMej3DnEM) [@blackpenredpen](/creator/youtube/blackpenredpen) 2020-11-17T22:00Z 1.4M followers, 374.2K engagements


"My first abstract algebra problem in XX years"  
[YouTube Link](https://youtube.com/watch?v=EgO3GwZ07EA) [@blackpenredpen](/creator/youtube/blackpenredpen) 2025-09-18T11:58Z 1.4M followers, 99.6K engagements


"Sum of 1/n3 Believe In Integrals"  
[YouTube Link](https://youtube.com/watch?v=Gfnfmut6zP0) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-05-17T16:00Z 1.4M followers, 96.8K engagements


"What Integration Technique Should I Use (trig sub u sub DI method partial fractions) calculus 2"  
[YouTube Link](https://youtube.com/watch?v=M5MaGUO0JDs) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-02-19T18:52Z 1.4M followers, 1.7M engagements


"Arc Length (formula explained)"  
[YouTube Link](https://youtube.com/watch?v=PK7HZiFG_VI) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-10-27T08:12Z 1.4M followers, 258.7K engagements


"You me and my first International Math Olympiad problem"  
[YouTube Link](https://youtube.com/watch?v=QNPq4VKD7ic) [@blackpenredpen](/creator/youtube/blackpenredpen) 2020-04-10T22:07Z 1.4M followers, 645.4K engagements


"Lambert W Function (domain range approximation solving equations derivative & integral)"  
[YouTube Link](https://youtube.com/watch?v=Qb7JITsbyKs) [@blackpenredpen](/creator/youtube/blackpenredpen) 2021-01-05T22:00Z 1.4M followers, 265.8K engagements


"i did another XXX integrals"  
[YouTube Link](https://youtube.com/watch?v=SOJlKFiQJ4U) [@blackpenredpen](/creator/youtube/blackpenredpen) 2022-12-25T11:53Z 1.4M followers, 176.1K engagements


"the most famous Ramanujan sum 1+2+3+.=-1/12"  
[YouTube Link](https://youtube.com/watch?v=U_g_OZLt4OU) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-12-28T21:09Z 1.4M followers, 379.7K engagements


"100 integrals (world record)"  
[YouTube Link](https://youtube.com/watch?v=dgm4-3-Iv3s) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-03-03T17:00Z 1.4M followers, 12.5M engagements


"The Limit (do not use L'Hospital rule)"  
[YouTube Link](https://youtube.com/watch?v=mZiPdyHyUvE) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-12-08T21:10Z 1.4M followers, 739K engagements


"Why is the derivative of ex equal to ex"  
[YouTube Link](https://youtube.com/watch?v=oBlHiX6vrQY) [@blackpenredpen](/creator/youtube/blackpenredpen) 2021-08-08T08:40Z 1.4M followers, 441.2K engagements


"integral of sin(x)/x from X to inf by Feynman's Technique"  
[YouTube Link](https://youtube.com/watch?v=s1zhYD4x6mY) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-08-20T18:30Z 1.4M followers, 1.3M engagements


"Is dy/dx a fraction"  
[YouTube Link](https://youtube.com/watch?v=u-I3kF3Drkk) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-08-09T16:52Z 1.4M followers, 212.3K engagements


"Convert degrees minutes and seconds (dms) into decimal degrees"  
[YouTube Link](https://youtube.com/watch?v=wM-RHMAzPb0) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-02-12T05:00Z 1.4M followers, 116K engagements


"Why is XX undefined"  
[YouTube Link](https://youtube.com/watch?v=12Nae7qYxs4) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-01-30T20:24Z 1.4M followers, 255.1K engagements


"Is ex=ln(x) solvable"  
[YouTube Link](https://youtube.com/watch?v=EMu-kYY5rdE) [@blackpenredpen](/creator/youtube/blackpenredpen) 2020-09-26T19:06Z 1.4M followers, 911.1K engagements


"Multiplication & Division in Base 2"  
[YouTube Link](https://youtube.com/watch?v=BnchEbti5t0) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-09-29T21:46Z 1.4M followers, 55.2K engagements


"Ultimate Inverse Laplace Transform Tutorial"  
[YouTube Link](https://youtube.com/watch?v=Gx6yQcmLuH8) [@blackpenredpen](/creator/youtube/blackpenredpen) 2020-03-28T20:05Z 1.4M followers, 242.1K engagements


"solving a cubic equation by completing the cube"  
[YouTube Link](https://youtube.com/watch?v=Jz-Z0jfs2V4) [@blackpenredpen](/creator/youtube/blackpenredpen) 2020-05-25T17:06Z 1.4M followers, 125.6K engagements


"My First Stanford Math Tournament Problem"  
[YouTube Link](https://youtube.com/watch?v=gYAQg7xn-Xo) [@blackpenredpen](/creator/youtube/blackpenredpen) 2021-09-24T10:10Z 1.4M followers, 369.2K engagements


"Auxiliary equations with complex roots for 2nd order linear differential equations"  
[YouTube Link](https://youtube.com/watch?v=u-eQaef1EWw) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-03-15T00:05Z 1.4M followers, 90.3K engagements


"integral of ln(x) from X to 1"  
[YouTube Link](https://youtube.com/watch?v=5RhbrPAlx2E) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-01-17T18:45Z 1.4M followers, 285.7K engagements


"integral of csc(x) the standard result calculus X tutorial"  
[YouTube Link](https://youtube.com/watch?v=byB0Vz3dcsE) [@blackpenredpen](/creator/youtube/blackpenredpen) 2015-02-13T04:55Z 1.4M followers, 195.9K engagements


"delta y vs. dy (differential)"  
[YouTube Link](https://youtube.com/watch?v=2ooWs_8hzxQ) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-08-01T16:55Z 1.4M followers, 300.8K engagements


"Math for fun sin(z)=2"  
[YouTube Link](https://youtube.com/watch?v=3C_XD_cCeeI) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-07-10T22:00Z 1.4M followers, 2M engagements


"solve differential with laplace transform sect 7.5#3"  
[YouTube Link](https://youtube.com/watch?v=6jW7FCyapXE) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-04-20T07:20Z 1.4M followers, 268.9K engagements


"Pell's equation (Introduction & example) ft. @octopuskeng"  
[YouTube Link](https://youtube.com/watch?v=9WP8jMSwRDw) [@blackpenredpen](/creator/youtube/blackpenredpen) 2024-12-30T11:32Z 1.4M followers, 24.8K engagements


"First Order Linear Differential Equation & Integrating Factor (introduction & example)"  
[YouTube Link](https://youtube.com/watch?v=DJsjZ5aYK_g) [@blackpenredpen](/creator/youtube/blackpenredpen) 2016-12-31T03:11Z 1.4M followers, 696.7K engagements


"epsilon-delta definition ultimate introduction"  
[YouTube Link](https://youtube.com/watch?v=DdtEQk_DHQs) [@blackpenredpen](/creator/youtube/blackpenredpen) 2022-01-15T12:00Z 1.4M followers, 504.7K engagements


"exact value of sin(3 degrees)"  
[YouTube Link](https://youtube.com/watch?v=GldJWGojFcs) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-06-05T19:42Z 1.4M followers, 457.2K engagements


"ln(-2) yes possible but NOT real"  
[YouTube Link](https://youtube.com/watch?v=IX_23EWpF5U) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-01-30T06:01Z 1.4M followers, 449.7K engagements


"Eulers identity proof for calculus X students"  
[YouTube Link](https://youtube.com/watch?v=Jqt67tJCiwQ) [@blackpenredpen](/creator/youtube/blackpenredpen) 2021-11-22T11:00Z 1.4M followers, 165.6K engagements


"Introduction to the Gamma function & the Pi function (extending the factorial)"  
[YouTube Link](https://youtube.com/watch?v=L4Trz6pFut4) [@blackpenredpen](/creator/youtube/blackpenredpen) 2018-01-15T08:18Z 1.4M followers, 410.2K engagements


"the ultimate integral starter (u sub IBP trig sub partial fractions & more)"  
[YouTube Link](https://youtube.com/watch?v=XOUwIdufY9Y) [@blackpenredpen](/creator/youtube/blackpenredpen) 2019-09-14T18:02Z 1.4M followers, 1.2M engagements


"how do we know the derivative of ln(x) is 1/x (the definition & implicit differentiation)"  
[YouTube Link](https://youtube.com/watch?v=Xc1YdpWcKsQ) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-09-25T14:30Z 1.4M followers, 789.4K engagements


"Laplace transform of f(t-a)u(t-a) the shifted unit step function"  
[YouTube Link](https://youtube.com/watch?v=_Ovz4u8FL9k) [@blackpenredpen](/creator/youtube/blackpenredpen) 2017-04-29T19:18Z 1.4M followers, 150.5K engagements


"My First Harvard MIT Math Tournament Problem"  
[YouTube Link](https://youtube.com/watch?v=jQuArBZO7PI) [@blackpenredpen](/creator/youtube/blackpenredpen) 2021-09-04T07:32Z 1.4M followers, 349.8K engagements


"I want all trig functions in one integral"  
[YouTube Link](https://youtube.com/watch?v=yAFImJwzw_g) [@blackpenredpen](/creator/youtube/blackpenredpen) 2023-10-14T07:15Z 1.4M followers, 806.4K engagements


"Why I don't teach LIATE (integration by parts trick)"  
[YouTube Link](https://youtube.com/watch?v=z33rYYUM4d8) [@blackpenredpen](/creator/youtube/blackpenredpen) 2021-09-08T17:08Z 1.4M followers, 421.6K engagements