Posted by Anonymous on Monday, May 7, 2012 at 8:01pm.
(1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X
(sin^2 x + cos^2 x - 2sin^2 x)^2 + (2sinxcosx)^2
= (cos^2x - sin^2x)^2 + (sin 2x)^2
= (cos 2x)^2 + (sin 2x)^2
= 1
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