If -1 < x < 1, then 2 tan-1 x = (a) tan-1 2x(b) tan-1 2x/(1 - x2)(c) – InterviewSolution

1.	If -1 < x < 1, then 2 tan-1 x = (a) tan-1 2x(b) tan-1 2x/(1 - x2)(c) tan-1 2x/(1 + x2)(d) cot-1 2/x
Answer» Answer is (b) tan^-1 2x/(1 - x²)

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