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posted by on .

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 - ,

    the first one is correct, with the second you have to use the product rule

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