(1 - cos 2x)^2 = (1 - (1 - 2(sin x)^2)^2 = (2(sin x)^2)^2 = 4(sin x)^4
Zidane D.
asked • 06/21/15How does (1-cos2x)^2=4sin^4x
The actual question is
limx->0 xtan2x-2xtanx/(1-cos2x)^2
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Muhammad C.
06/21/15