Elinor Claborn
Thursday, August 11, 2011
Simplify the expression (A) : tan^2(B/4)-sec^2(B/4) (B): csc^2(A/5)-cot(A/5)?
use trig's formulas : a href="http://en.wikipedia.org/wiki/Trigonometry" rel="nofollow"http://en.wikipedia.org/wiki/Trigonometr…/a
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