# Thread: derivatives with trigonometric functions

1. ## derivatives with trigonometric functions

Use the equations and relations given below to answer the following questions.

given

$f(pi/6) = 10$
$f'(pi/6) = -4$
$h(x) = (-sin(x)/f(x))$

what is $h'(pi/6) = ?$

2. never mind, i just had to use the quotient rule, and find out the derivative of -sin(x) is -cos(x).