Question

derivada regra da cadeia y = cos ^- 4 x 

Answer 1

$y=cos x^{-4}$

$y=h(u)$ = 
$u=g(x)$ = $x^{-4}$

$g'(x) = \frac{-4}{ x^{5} } \\ \\ h'(u) = -sen(u) = -sen(g(x))$ 

 f'(x)=$\frac{4sen( x^{-4} )}{ x^{5} }$