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数学
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如何将sin(2x)*cos(x)+sin^2(x) 展开为sin(x)的表达式?或者如何化简?
人气:490 ℃ 时间:2020-05-23 15:25:28
解答
原式=(2sinxcosx)cosx+sin²x
=2sinx*cos²x+sin²x
=2sinx*(1-sin²x)+sin²x
=-2sin³x+sin²x+2sinx
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