(1-cos2a)^2 / (1+cos2a)^2 = (2sin^2 a)^2 / (cos^2 a)^2 左边的等于
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(1-cos2a)^2 / (1+cos2a)^2 = (2sin^2 a)^2 / (cos^2 a)^2 左边的等于右边我要过程···
不懂啊.数学没救了.
不懂啊.数学没救了.
![(1-cos2a)^2 / (1+cos2a)^2 = (2sin^2 a)^2 / (cos^2 a)^2 左边的等于](/uploads/image/z/19393409-65-9.jpg?t=%281-cos2a%29%5E2+%2F+%281%2Bcos2a%29%5E2+%3D+%282sin%5E2+a%29%5E2+%2F+%28cos%5E2+a%29%5E2+%E5%B7%A6%E8%BE%B9%E7%9A%84%E7%AD%89%E4%BA%8E)
(1-cos2a)^2 / (1+cos2a)^2
=[1-(1-2sin^2 a)]^2 / [1+(2cos^2 a)-1]^2
=[1-1+2sin^2 a]^2 / [1+2cos^2 a-1]^2
=(2sin^2 a)^2 / (2cos^2 a)^2
=(sin^2 a)^2 / (cos^2 a)^2
=[1-(1-2sin^2 a)]^2 / [1+(2cos^2 a)-1]^2
=[1-1+2sin^2 a]^2 / [1+2cos^2 a-1]^2
=(2sin^2 a)^2 / (2cos^2 a)^2
=(sin^2 a)^2 / (cos^2 a)^2
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