Homework Help: Calculus

Posted by Janet on Monday, May 9, 2011 at 11:39pm.

Evaluate integral, don't use calculator.
I'll use the S as the sign for integral
S 4 sin (theta)d(theta) from pi/2 to pi

I know the answer is 4 because I enter it in on my calculator, but don't know the steps to get to the answer.

Please help.

Calculus - drwls, Monday, May 9, 2011 at 11:55pm
The steps are:
(1) compute the indefinite integral.
in this case it is -4 cos theta

(2) Compute the value of the indefinite integral at theta = pi and subtract the value at theta = pi/2.

That would be -4(-1) -0 = 4

You won't learn integral calculus without learning how to compute integrals.

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