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cos33°cos87°+sin33°cos177°
2024-11-26 09:15:07
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IT界一姐
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cos177°=cos(90°+87°) =-cos87°所以, 原式=cos33°cos87°-sin33°sin87° =cos(33°+87°) =cos120° =-2分之1
2024-11-26 09:15:07
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