Posted by Angie on Tuesday, December 20, 2011 at 5:08pm.
h = f/g so
h' = (f'g - fg')/g^2
h'(x) = [-x csc^2(x) + cot(x)]/x^2
h'(pi/2) = [-pi/2 * 1 + 0]/(pi^2 / 4)
= - 2/pi
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