Question

1.sinx+sin2x=1,then cos2x+xos4x=?

Answer 1

sin²x + cos²x = 1, so cos²x = 1 - sin²x = 1 - (1 - sinx) = sin x, and cos^4x = sin²x. 

So cos²x + cos^4x = sin x + sin²x = 1. Ans

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