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blackpenredpen

106 Videos (Page 1/3)

12:19 Fast English (US)

Regular math vs competition math

blackpenredpen - 2 years ago

43,046 views
10:02 Fast English (US)

my solution to this Stanford math tournament tiebreaker

blackpenredpen - 2 years ago

60,699 views
8:36 Fast English (US)

math for fun, solving i^x=2

blackpenredpen - 2 years ago

129,879 views
9:36 Fast English (US)

be careful when you use the law of sine

blackpenredpen - 2 years ago

46,679 views
8:21 Fast English (US)

calculus teacher vs "I know it already" student

blackpenredpen - 2 years ago

238,682 views
10:31 Fast English (US)

Solving A Double Integral Using Jacobian (calculus 3)

blackpenredpen - 2 years ago

37,842 views
18:20 Fast English (US)

the last question on my precalculus test

blackpenredpen - 2 years ago

41,560 views
17:03 Fast English (US)

believe in the DI method for integration by parts

blackpenredpen - 2 years ago

85,220 views
6:30 Fast English (US)

i-th root of -1

blackpenredpen - 2 years ago

275,323 views
14:42 Conversational English (US)

Using Feynman's technique TWICE! (the integral of sin^3(x)/x^3 from 0 to inf)

blackpenredpen - 2 years ago

199,993 views
8:01 Fast English (US)

the hardest integral from the BMT integration bee

blackpenredpen - 2 years ago

198,213 views
8:24 Fast English (US)

when your calculus test has only one problem

blackpenredpen - 2 years ago

201,022 views
15:00 Fast English (US)

how Laplace solved the Gaussian integral

blackpenredpen - 2 years ago

453,197 views
8:53 Fast English (US)

how Richard Feynman would integrate 1/(1+x^2)^2

blackpenredpen - 3 years ago

303,179 views
11:33 Fast English (US)

3 math Olympiad factoring tricks

blackpenredpen - 3 years ago

108,575 views
16:15 Fast English (US)

if I were 3 years old, then I would brutal force all these fractions!

blackpenredpen - 3 years ago

65,890 views
8:47 Fast English (US)

solving tan(1/x)=1/tan(x)

blackpenredpen - 3 years ago

308,245 views
6:21 Fast English (US)

can you solve this middle school math competition problem (from Berkeley)?

blackpenredpen - 3 years ago

42,047 views
5:03 Fast English (US)

A quick look of the Princeton University math competition

blackpenredpen - 3 years ago

31,663 views
4:16 Fast English (US)

talking to a math PhD friend be like (unscripted, unedited)

blackpenredpen - 3 years ago

12,727 views
10:52 Fast English (US)

the logarithm triangle problem

blackpenredpen - 3 years ago

108,787 views
12:28 Fast English (US)

baby calculus vs adult calculus

blackpenredpen - 3 years ago

74,843 views
6:52 Fast English (US)

(x+y)^2 (from prealgebra to abstract algebra)

blackpenredpen - 3 years ago

88,397 views
9:18 Fast English (US)

Can we do a direct substitution between these two integrals?

blackpenredpen - 3 years ago

64,242 views
17:05 Fast English (US)

the last lecture of my calculus 1 class

blackpenredpen - 3 years ago

80,402 views
10:44 Fast English (US)

5 levels of polynomial equation (from good to AWESOME!)

blackpenredpen - 3 years ago

117,075 views
9:21 Fast English (US)

when you want to use complex numbers to integrate 1/(x^2+1)

blackpenredpen - 3 years ago

160,721 views
9:08 Fast English (US)

how a simple quadratic equation solves the Fibonacci sequence

blackpenredpen - 3 years ago

63,324 views
11:24 Fast English (US)

4 impossible-looking equations

blackpenredpen - 3 years ago

152,028 views
8:00 Fast English (US)

solving b^x=log_b(x)

blackpenredpen - 3 years ago

90,216 views
8:05 Fast English (US)

HARD SAT math that sounds like real analysis

blackpenredpen - 3 years ago

52,244 views
11:12 Fast English (US)

the last question on a Harvard-MIT Math Tournament!

blackpenredpen - 3 years ago

224,621 views
6:29 Fast English (US)

sqrt(i+sqrt(i+sqrt(i+...))) = ?

blackpenredpen - 3 years ago

97,195 views
8:37 Fast English (US)

my calculus exam #1 (100% gets an In-N-Out gift card)

blackpenredpen - 3 years ago

263,714 views
9:18 Fast English (US)

an unfair calculus 1 homework question

blackpenredpen - 3 years ago

142,291 views
9:59 Fast English (US)

my first time differentiating the quadratic formula

blackpenredpen - 3 years ago

167,304 views
14:10 Fast English (US)

Stanford math tournament algebra tiebreaker

blackpenredpen - 3 years ago

113,898 views
5:50 Fast English (US)

taking a derivative that WolframAlpha can't handle

blackpenredpen - 3 years ago

58,666 views
13:58 Fast English (US)

4 "curves" to save your grade

blackpenredpen - 3 years ago

148,200 views
6:34 Fast English (US)

why the area under the tangent line of 1/x is special

blackpenredpen - 3 years ago

290,257 views
19:27 Fast English (US)

the hardest calc 1 topic, the epsilon-delta definition of a limit

blackpenredpen - 3 years ago

146,322 views
10:45 Fast English (US)

Solving sin(x)^sin(x)=2

blackpenredpen - 3 years ago

276,365 views
7:28 Fast English (US)

Euler’s identity proof with Taylor series

blackpenredpen - 3 years ago

99,003 views
8:46 Fast English (US)

calculus is like magic!

blackpenredpen - 3 years ago

68,401 views
8:15 Conversational English (US)

one of my favorite math equations

blackpenredpen - 3 years ago

89,482 views
8:21 Fast English (US)

Calculus Teacher vs. Power Rule Student

blackpenredpen - 4 years ago

300,714 views
14:53 Fast English (US)

Why I don't teach LIATE (integration by parts trick)

blackpenredpen - 4 years ago

149,911 views
7:57 Fast English (US)

My First Harvard MIT Math Tournament Problem

blackpenredpen - 4 years ago

260,093 views
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