blackpenredpen

@blackpenredpen

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1.4M

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#9,639

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#40,291

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2.4K

Video Count

228.7M

Video View

1.4M

Subscriber

#9,639

United States Rank

#40,291

Global Rank

blackpenredpen - Retention Analytics - FameLifter

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21,289

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Recent videos with detailed analytics and insights

Video Details	Duration	Published Date	Time	Views
Why do mathematicians think disc=square?	6:34	2 Ocak	16:16	9,707
How to welcome a math PhD friend at the airport! @drpeyam	4:28	31 Aralık	02:20	17,823
THIS LIMIT IS WRONG but how do we prove it?	15:14	8 Aralık	14:26	13,138
Can f'(x)=f^-1(x)?	10:31	30 Kasım	02:53	23,817
Only math majors would do this! (epsilon-delta proof for a simple limit)	12:45	20 Kasım	14:18	4,027
How to find a delta for a specific epsilon (epsilon-delta definition of a limit)	7:41	16 Kasım	13:13	2,543
Epsilon-delta proof without THAT TRICK!	11:39	11 Kasım	14:42	8,102
Brilliant Trig Identity Challenge!	22:51	29 Ekim	16:52	4,170
That chain rule joke!	8:55	27 Eylül	12:00	23,208
Trying my first abstract algebra problem in 14 years!	6:56	18 Eylül	11:58	57,923
Why are integrals SO HARD? (My 5 reasons and how to prepare for integrals)	11:41	12 Eylül	13:01	20,923
I’m sorry, I have been saying “let x=1” wrong for 13 years	2:36	8 Eylül	12:00	101,599
Can x^y=yx?	7:22	4 Eylül	08:23	73,623
The square root of the 2 by 2 zero matrix	9:39	22 Ağustos	13:04	20,228
Calculus students don’t use these inequalities anymore!	16:37	15 Ağustos	10:52	23,331
Factoring a trinomial (what I learned in Taiwan vs in US)	10:58	13 Ağustos	13:22	46,816
Here's how I would solve this high school math question without calculus (finding extrema of trig)	8:05	8 Ağustos	11:35	14,803
Most calculus students won't use the easy solution	8:50	4 Ağustos	17:24	42,828
How to evaluate an infinite series with complex numbers	7:41	31 Temmuz	13:15	11,554
If 1+z+z^2+z^3+z^4+z^5+z^6=0, then z+z^2+z^4=?	9:16	26 Temmuz	17:23	24,442
Can A^2+I=0?	12:54	24 Temmuz	06:18	23,710
The perfect trick to solve this equation (two-cube-root!)	7:25	16 Temmuz	23:32	8,960
A taste of "when there are no numbers in math"	11:57	7 Temmuz	13:06	15,489
Believe in calculus, NOT pictures!	8:41	24 Haziran	04:08	10,439
100 integrals (remake + solutions) full collection on Patreon	36:34	6 Haziran	13:20	5,187
Big Brilliant Integral	10:19	23 Mayıs	11:53	18,318
$What Integration Technique Do I Use? Q1 to Q5 (trig sub, u sub, DI method, partial fraction) calc 2$ What Integration Technique Do I Use? Q1 to Q5 (trig sub, u sub, DI method, partial fraction) calc 2	16:29	18 Mayıs	06:52	7,064
The last virtual office hour! (Chegg Trig & Precalculus)	1:00:18	13 Mayıs	14:50	5,694
The coolest way to solve an equation!	7:50	10 Mayıs	09:00	33,906
cube roots of i	4:28	8 Mayıs	07:18	47,893
All solutions to x^2=2^x (remake+notes)	14:47	1 Mayıs	08:03	48,560
A quick guide to finding the range of a fuction! Chegg Trig & Precalculus office hour	1:00:26	29 Nisan	14:56	5,493
I finally found the cubic vertex formula without calculus!	16:50	29 Nisan	12:01	10,876
Are they the same function? Be careful with the domain! Chegg Trig/Precalculus office hour	1:00:20	22 Nisan	02:54	7,211
Making a cubic equation have a double root	11:43	19 Nisan	12:00	15,633
5 Math Video Categories That Grew My Channel (12 Years on YouTube)	20:37	15 Nisan	12:00	11,821
How to solve logarithmic equations! Chegg Trig & Precalculus Office Hours with blackpenredpen	1:00:24	15 Nisan	02:51	7,629
My first x^x congruence: x^x≡2 (mod5)	22:01	11 Nisan	08:12	32,985
Let's solve exponential equations! Chegg Trig & Precalculus Office Hour!	1:00:12	8 Nisan	03:05	8,310
How to solve HARD polynomial equations! Chegg Trig & Precalculus Office Hours	1:00:12	1 Nisan	02:58	6,747
Math for fun: a 2nd derivative rule?	9:58	27 Mart	11:01	23,432
sin(x)+cos(x)=? Vertical asymptote vs hole? Inverse of (ax+b)/(cx+d)=? Chegg Precalculus office hour	59:43	25 Mart	02:49	7,756
The 50-Ball Problem	14:39	23 Mart	07:34	18,040
Which is bigger: a^3+b^3 or c^3?	4:21	21 Mart	07:56	17,401
Be careful when you use the law of sines! What's sin(18 deg)? & more! Chegg Precalculus Office Hours	1:00:03	18 Mart	02:50	7,805
"Dear Bprp, I have a pretty unusual question": If sqrt(a+sqrt(a+sqrt(a)))=128, then floor(a)=?	10:42	14 Mart	12:00	47,885
NONSTOP: 100 basic precalculus equations & inequalities	5:25:41	11 Mart	11:00	32,226
How to solve a tricky domain problem and more? Chegg Trig & Precalculus Office Hours	59:47	11 Mart	02:53	6,999
"This fully tests your understanding of calc 1 differentiation & integration" Cambridge STEP 1 exam	22:31	8 Mart	15:07	16,856
Ask me Trig! How do you solve tricky trigonometric identity problems? (Chegg Virtual Office Hours)	59:32	4 Mart	03:49	9,515