Question: Differentiate f ( x ) = l n ( c o s x ) . f ' ( x ) = t a n x

Differentiate f(x)=ln(cosx).
f'(x)=tanx
f'(x)=-tanx
f'(x)=cscxsecx
f'(x)=-cscxsecx
Differentiate f(x)=ln(cosx). f'(x)=tanx f'(x)=-tanx f'(x)=cscxsecx f'(x)=-cscxsecx

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