sin27°sin33°-cos333°sin57°=______.-数学

题目简介

sin27°sin33°-cos333°sin57°=______.-数学

题目详情

sin27°sin33°-cos333°sin57°=______.
题型:填空题难度:偏易来源:不详

答案

sin27°sin33°-cos333°sin57°
=sin27°cos57°-cos27°sin57°
=sin(27°-57°)
=sin(-30°)
=-class="stub"1
2

故答案为:-class="stub"1
2

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