Question

Use l'Hospital's Rule to evaluate the limit. Look at attachment below. @Calculus1

Answer 1

Recall f'(cosx) = -senx.
Pi over three is just a constant. So at the denominator we just have f'(x) which is 1.
\[-senx\] \[-sen60°\] = \[-\frac{\sqrt3}{2}\]

Answer 2

Awesome, thanks.