题目
((派/2)
提问时间:2021-03-16
答案
sin2A=sin[(A+B)+(A-B)]
=sin(A+B)cos(A-B)+cos(A+B)sin(A-B)
由于pi
=sin(A+B)cos(A-B)+cos(A+B)sin(A-B)
由于pi
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