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OpenStudy (anonymous):
s.one plz help me .! 2cos^2x-2cos2x+4sinxcosx+1 = 0
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ganeshie8 (ganeshie8):
\(\cos 2x = \cos^2x - \sin^2 x\)
OpenStudy (anonymous):
i have sin^2x + 2sin2x +1 .... and i stuck
OpenStudy (anonymous):
use 2 cos^2 x = 1-sin 2x after that convert all of them to half angles of tan
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