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sin(2x+45)=cos

分类: 作业答案 • 2021-12-20 01:37:46

问题描述：

sin(2x+45)=cos

答

sin(2x+45)=sin(90-(45-2x))=cos(45-2x)=cos(2x-45)

答

sin(2x+45°)=cos[π/2-(2x+π/4)]=cos(45°-2x)

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sin(2x+45)=cos

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