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

  • Thread starter emc92
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  • #1
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got stuck on doing the substitution.. any suggestions?
 

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  • #2
SammyS
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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.
 
  • #3
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wow, i did not see that.
thanks so much!
 

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