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blackpenredpen
@blackpenredpen
Education
2.4K
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231.8M
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1.4M
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#9,855
United States Rank
#40,783
Global Rank
2.4K
Video Count
231.8M
Video View
1.4M
Subscriber
#9,855
United States Rank
#40,783
Global Rank
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Title A-Z
1:47
One satisfying factoring problem x^5+x^4+1
112.5K
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5 days ago
1:32
e^pi vs pi^e
103.3K
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115
1 week ago
6:00
Next up x^4=x. I don't see why not!
45.5K
1.4K
162
1 week ago
9:50
I thought 0^x=2 was impossible!
49.5K
2.1K
310
2 weeks ago
1:20
Can 0^x=2?
103.8K
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175
2 weeks ago
9:12
Is 1-1+1-1+1-1+...=1/2 really true?
30.1K
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1 month ago
9:33
How to solve a functional equation on the AIME
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686
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1 month ago
8:28
My All-In-One Calculus Problem! (now in a matrix!)
30.8K
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1 month ago
6:41
Proving the quadratic formula using calculus? (just my attempt)
34.3K
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137
1 month ago
5:28
Can we have a right triangle with sides 1, x and x^2 (but the hypotenuse is x)
14K
613
114
2 months ago
6:17
So I tried integration by parts (solved another integral instead!)
12K
518
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2 months ago
6:36
So you want another logarithm triangle (w/ law of cosines this time!)
11.2K
543
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3 months ago
15:27
Finding the volume of a 4d sphere
14.1K
881
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3 months ago
9:54
My first triple improper integral!
11.3K
733
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3 months ago
13:59
This calculus proof is only for math majors (National Taiwan University entrance exam)
6.6K
392
32
3 months ago
8:05
Can x factorial = 0?
10.8K
641
142
3 months ago
14:15
I made a volume of revolution problem "MORE FUN"
5.7K
380
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4 months ago
10:31
The first calculus question on a National Taiwan University entrance exam (for transfers)
7K
348
29
4 months ago
19:53
A taste of calculus 1 problems for math majors!
8.9K
470
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4 months ago
11:44
Brilliant minimum problem
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508
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4 months ago
13:30
I created this double integral, am I the next Gauss?
9K
593
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4 months ago
6:34
Why do mathematicians think disc=square?
9.7K
437
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5 months ago
4:28
How to welcome a math PhD friend at the airport! @drpeyam
17.8K
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5 months ago
15:14
THIS LIMIT IS WRONG but how do we prove it?
13.1K
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6 months ago
10:31
Can f'(x)=f^-1(x)?
23.8K
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6 months ago
12:45
Only math majors would do this! (epsilon-delta proof for a simple limit)
4K
252
18
6 months ago
7:41
How to find a delta for a specific epsilon (epsilon-delta definition of a limit)
2.5K
179
14
6 months ago
11:39
Epsilon-delta proof without THAT TRICK!
8.1K
488
34
6 months ago
22:51
Brilliant Trig Identity Challenge!
4.2K
285
34
7 months ago
8:55
That chain rule joke!
23.2K
1.3K
77
8 months ago
6:56
Trying my first abstract algebra problem in 14 years!
57.9K
2.6K
349
8 months ago
11:41
Why are integrals SO HARD? (My 5 reasons and how to prepare for integrals)
20.9K
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131
8 months ago
2:36
I’m sorry, I have been saying “let x=1” wrong for 13 years
101.6K
5.4K
919
9 months ago
7:22
Can x^y=yx?
73.6K
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292
9 months ago
9:39
The square root of the 2 by 2 zero matrix
20.2K
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98
9 months ago
16:37
Calculus students don’t use these inequalities anymore!
23.3K
1.3K
73
9 months ago
10:58
Factoring a trinomial (what I learned in Taiwan vs in US)
46.8K
1.6K
237
9 months ago
8:05
Here's how I would solve this high school math question without calculus (finding extrema of trig)
14.8K
561
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10 months ago
8:50
Most calculus students won't use the easy solution
42.8K
1.4K
83
10 months ago
7:41
How to evaluate an infinite series with complex numbers
11.6K
667
52
10 months ago
9:16
If 1+z+z^2+z^3+z^4+z^5+z^6=0, then z+z^2+z^4=?
24.4K
930
83
10 months ago
12:54
Can A^2+I=0?
23.7K
1.2K
80
10 months ago
7:25
The perfect trick to solve this equation (two-cube-root!)
9K
719
44
10 months ago
11:57
A taste of "when there are no numbers in math"
15.5K
725
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11 months ago
8:41
Believe in calculus, NOT pictures!
10.4K
613
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11 months ago
36:34
100 integrals (remake + solutions) full collection on Patreon
5.2K
271
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Jun 6, 2025
10:19
Big Brilliant Integral
18.3K
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May 23, 2025
16:29
What Integration Technique Do I Use? Q1 to Q5 (trig sub, u sub, DI method, partial fraction) calc 2
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May 18, 2025
1:00:18
The last virtual office hour! (Chegg Trig & Precalculus)
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May 13, 2025
7:50
The coolest way to solve an equation!
33.9K
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May 10, 2025
