题目内容
sin27°sin33°-cos333°sin57°=______.
sin27°sin33°-cos333°sin57°
=sin27°cos57°-cos27°sin57°
=sin(27°-57°)
=sin(-30°)
=-
.
故答案为:-
.
=sin27°cos57°-cos27°sin57°
=sin(27°-57°)
=sin(-30°)
=-
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故答案为:-
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