Posted by Don on Saturday, December 17, 2011 at 6:47pm.
cot^4 - csc^4
= (cot^2 - csc^2)(cot^2 + csc^2)
= (-1)(cot^2 + csc^2)
= -cot^2 - csc^2
remember csc^2 = 1 + cot^2 ??
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