derivatives with trigonometric functions

• October 28th 2009, 02:25 PM
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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 $h'(pi/6) = ?$
• October 28th 2009, 02:40 PM
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never mind, i just had to use the quotient rule, and find out the derivative of -sin(x) is -cos(x).