(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(1—cos2a)/(cot(a/2)—tan(a/2))化简[-2sin(
(1—cos2a)/(cot(a/2)—tan(a/2)) 化简
(1—cos2a)/(cot(a/2)—tan(a/2)) 化简
(1—cos2a)/(cot(a/2)—tan(a/2)) 化简
[-2sin(a/2)cos(a/2)]^3