题目内容
sin422.5°-cos422.5°=_______________________.
解析：原式=（sin222.5°+cos222.5°）(sin222.5°-cos222.5°)
=sin222.5°-cos222.5°
=-cos45°=-
.
答案:-
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题目内容
sin422.5°-cos422.5°=_______________________.
解析：原式=（sin222.5°+cos222.5°）(sin222.5°-cos222.5°)
=sin222.5°-cos222.5°
=-cos45°=-.
答案:-