Posted by **Dan** on Sunday, November 9, 2008 at 9:20pm.

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.

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