Posted by Xie on Friday, October 28, 2011 at 2:26am.
the derivative of cot x = -csc^2 x
the derivative of tan x = sec^2 x
.. and you do this:
[ low*d(high) - high*d(low) ] / (low)^2
high = numerator
low = denominator
d(high) and d(low) = respective derivatives
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