\tan ^ - 1 x %2B \tan ^ - 1 ( \frac 2 x 1 - x ^ 2 – InterviewSolution

1.	\tan ^ - 1 x %2B \tan ^ - 1 ( \frac 2 x 1 - x ^ 2 ) = \tan ^ - 1 ( \frac 3 x - x ^ 3 1 - 3 x ^ 2 )
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