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OpenStudy (anonymous):
express cos^2 (x) in terms of cos (2x)
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OpenStudy (waleed_imtiaz):
U know the formula for double angle identity..... cos2x= 2cos^2(x) -1 so u can write cos^2(x)=(1+cos2x)/2
OpenStudy (waleed_imtiaz):
understand or not???
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