# CALC

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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.

• CALC -

f'(x)= (2)/(x^2 -3)-(2x+5)*2x/(x^2-3)^2
see the first term.

next one
use the product rule.

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