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2sina(x-π/4)sin(x+π/4) 怎么转换成(sinx-cosx)(sinx+cosx)?
人气:307 ℃ 时间:2020-06-19 08:43:48
解答
2sin(x-π/4)sin(x+π/4)=sin(2x-π/2)=-cos2x
=-(cosx^2-sinx^2)=sinx^2-cosx^2=(sinx-cosx)(sinx+cosx)
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