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September 17, 2014

September 17, 2014

Posted by **Quetzally** on Thursday, March 8, 2012 at 9:04am.

csc^4 x-cot^4x= Csx^2 x + cot^2x

- Trig -
**Steve**, Thursday, March 8, 2012 at 12:22pmrecall 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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