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sin(a+B)sin(B-y)-cos(a-B)cos(y-B) 化简
人气:361 ℃ 时间:2020-03-26 22:23:45
解答
sin(a+B)sin(B-y)-cos(a+B)cos(y-B)
=sin(a+B)sin(B-y)-cos(a+B)cos(B-y)
=-cos(a+B+B-y)
=-cos(a+2B-y)
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