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sin^220+cos^280+sin20cos80=

分类: 作业答案 • 2022-01-02 13:31:30

问题描述：

答

sin^220+cos^280+sin20cos80
=sin^(220-180)+cos^(360-280)+sin20cos80
=sin^40+cos^80+sin20cos80
=

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A是锐角,sin（A-30）=1/3.则cosA=

sin^220+cos^280+sin20cos80=

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