Question

Derivadas...
Seja y=3/x encontre f'(3):

Answer 1

$f(x)= \frac{3}{x}\to f(x)=3x^{-1}\\\\f'(x)=-3x^{-2}\to f'(x)=- \frac{3}{x^2}\\\\f'(3)=- \frac{3}{3^2}\to f'(3)=- \frac{1}{3}$