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数学
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化简2sin(π-x)cosx+2cos²x
人气:341 ℃ 时间:2020-02-06 09:12:23
解答
2sin(π-x)cosx+2cos²x
=2sinxcosx+(2cos²x-1)+1
=sin2x+cos2x+1
=√2sin(2x+π/4)+1.
不望采纳.大神啊
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