
求大神解答,详细步骤更好
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sin200 = sin(180+20) = -sin20cos700 = cos(2*360-20) = cos(-20) = cos20sin100 = sin(180-80) = sin80cos500 = cos(360+140) = cos140 = cos(180-40) = -cos40原式=-sin20cos20 - sin80cos40
追问
呐呢,你给我来sin,cos?
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