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January 17th, 2010, 03:51 PM   #1
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Calculate F'(x)

F(x) =

why can't I just sub cosx in and get ?
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January 17th, 2010, 05:58 PM   #2
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Re: Calculate F'(x)

Quote:
Originally Posted by 450081592
F(x) =

why can't I just sub cosx in and get ?
Back to basics. You want the x derivative of something of the form f(u(x)).
From elem. calculus you have df/dx = (df/du)(du/dx).
For your problem, you have u=cosx.

is the df/du part. du/dx = -sinx is needed to get the correct result.
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January 18th, 2010, 03:52 PM   #3
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Re: Calculate F'(x)

If
then:


where a is a constant.
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