(1—cos2a)/(cot(a/2)—tan(a/2)) 化简
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(1—cos2a)/(cot(a/2)—tan(a/2)) 化简
![(1—cos2a)/(cot(a/2)—tan(a/2)) 化简](/uploads/image/z/18855849-57-9.jpg?t=%EF%BC%881%E2%80%94cos2a%29%2F%28cot%28a%2F2%29%E2%80%94tan%28a%2F2%29%29+%E5%8C%96%E7%AE%80)
[-2sin(a/2)cos(a/2)]^3
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