could someone check this for me?

1.

2.

THANKS

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- Sep 27th 2009, 10:41 PMdifferentiateintegration of trigonometric functions
could someone check this for me?

1.

2.

THANKS - Sep 27th 2009, 10:48 PMCalculus26
Once you have int( 2cos^2(x)sin(x)dx)

Let u = cos(x)

then you have simply -2 int(u^2du)

isn't correct since du/dx would be cos(2x) - Sep 27th 2009, 10:49 PMProve It
- Sep 27th 2009, 10:52 PMProve It
- Sep 27th 2009, 11:00 PMdifferentiate
thank you. I get it now.

so for this one:

- Sep 27th 2009, 11:02 PMProve It