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已知派/2<b<3/4派,cos(a+b)=12/13,sin(a+b)=3/5,求sin2a
人气:342 ℃ 时间:2020-01-28 13:02:42
解答
派/2
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已知π/2<B<A<3π/4,cos(A-B)=12/13,sin(A+B)=-3/5,求sin2A
(派/2)
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