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[主观题]
sin27°sin33°-cos333°sin57°=______.sin27°sin33°-cos333°sin57°=______.
提问人:网友blueicel
发布时间:2022-01-07
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sin27°sin33°-cos333°sin57° =sin27°cos57°-cos27°sin57° =sin(27°-57°) =sin(-30°) =- 1 2 . 故答案为:- 1 2 .
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C.
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