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1. If sin x + sin²x = 1, then the value ofcos2x + cos*x is​

Answer»

sin²x + cos²x = 1, so cos²x = 1 - sin²x = 1 - (1 - SINX) = SIN X, and cos^4x = sin²x.So cos²x + cos^4x = sin x + sin²x = 1.



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