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106 Videos (Page 3/3)

5:13 Fast English (US)

Evaluate cos(20)cos(40)cos(80) (no calculator!)

blackpenredpen - 8 years ago

47,822 views
5:05 Fast English (US)

Factoring 5-term polynomials by grouping

blackpenredpen - 9 years ago

266,629 views
14:41 Fast English (US)

Understand u substitution for integration (3 slightly trickier examples)

blackpenredpen - 9 years ago

188,273 views
12:30 Fast English (US)

Understand u-substitution, the idea!

blackpenredpen - 9 years ago

78,736 views
6:01 Expert English (US)

integral of 1/(2+cos(x)) , Weierstrass substitution

blackpenredpen - 9 years ago

101,744 views
9:33 Fast English (US)

solving a trig equation with the double angle identity (hard one)

blackpenredpen - 9 years ago

26,689 views
16:58 Fast English (US)

integration by parts, DI method, VERY EASY

blackpenredpen - 9 years ago

1,054,351 views
5:08 Fast English (US)

Definition of derivative in terms of a limit, (def 1)

blackpenredpen - 10 years ago

7,811 views
5:43 Fast English (US)

derivative of x^-2 with the definition of derivative

blackpenredpen - 10 years ago

6,728 views
4:45 Fast English (US)

Integral of (1+x)/(1+x^2), calculus u-substitution

blackpenredpen - 11 years ago

108,481 views
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