Question

encontre a derivada da função f(x)= cos(3x²+1)

Answer 1

$f(x)=\cos(3x^2+1)$

$u=3x^2+1$

$f(x)=\cos(u)$

$f'(x)=u'\cdot(-\sin (u))$

$u'=6x$

$f'(x)=6x(-\sin (u))$

$f'(x)=-6x\sin(3x^2+1)$