Sin A + sin square A = 1 ,cos square a + cos 4 A is?
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sinA+sin²A=1
sinA=1-sin²A
sinA=cos²A ---------->eq1
cos²A+cos⁴A=cos²A+(cos²)²A
=sinA+sin²A. (by eq 1)
=1. (given sinA + sin²A =1)
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