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Mathematics 19 Online
OpenStudy (anonymous):

cos2x=cos2x-sin2x (1/5 √ (1/5 √ )-(2/ 5 √ )(2/5 √ )=1/5-4/5= -3/5 am i right

OpenStudy (anonymous):

yes this idenity is also right but remeber its cos2x=cos^2(x)-sin^2(x)

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