Surface area of sin(x) rotated about the x-axis

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emc92
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got stuck on doing the substitution.. any suggestions?
 

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emc92 said:
got stuck on doing the substitution.. any suggestions?

For one thing, the derivative of 1 + cos2(x) is -2sin(x)cos(x), not -2sin(x).

That substitution doesn't seem to help anyway.

Try u = cos(x) instead.
 

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