Homework Help: calculus

Posted by Dan on Sunday, November 9, 2008 at 4:26pm.

find the following derivatives:

f(x) = (2x+5)/(x^2-3)

f'(x)= (2)*(x^2 -3)-(2x+5)*2x/(x^2-3)^2

is that correct???

f(x)= (lnx)(cos x)

f'(x)= 1/x*-sinx
or do i have to use the product rule??

thank you.

calculus - Anonymous, Friday, November 14, 2008 at 10:58am
the first one is correct, with the second you have to use the product rule

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