1.

Cos A + cos square is equal to 1 then find sin square A + sin power 4 A

Answer»
\cos( a) + \cos ^{2} (a) = 1 \\ \cos(a ) = 1 - \cos ^{2} (a) \\ \cos(a ) = \sin ^{2} (a) \\ \\ \sin ^{2} (a) + \sin ^{4} (a) = \cos(a) + \cos ^{2} (a) = 1


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