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Cos^2(75)-sin^2(45)=?Plz answer this question

Answer»

What u have a main problem with this question is COS^2(75)

so WRITE cos^75 as cos(45 + 30)
and then use the formula of cos(A + B) = COSACOSB - sinAsinB

PUT the standard values of on solving and u will get your answer



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