Posted by Quetzally on Thursday, March 8, 2012 at 9:04am.
recall that a^2 - b^2 = (a+b)(a-b)
csc^4 - cot^4 = (csc^2 - cot^2)(csc^2 + cot^2)
if you recall that csc^2 = 1 + cot^2 the rest is downhill. . .
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