将等式右边全部转化为只有sin^2(x) 的方程,然后用 X = sin^2(x) 代入,化简……
cos^2(x) = 1 - sin^2(x)
tan^2(x) = （sinx / cosx）^2
最后 F（X）= （1 - X）+ [ X /（ 1-X）]
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