题目内容
求值:sin415°-cos415°=______.
sin415°-cos415°
=(sin215°+cos215°)(sin215°-cos215°)
=sin215°-cos215°
=-cos30°
=-
.
故答案为:-
.
=(sin215°+cos215°)(sin215°-cos215°)
=sin215°-cos215°
=-cos30°
=-
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故答案为:-
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