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If `tan^(-1) y = tan^(-1) x + tan^(-1)((2x)/(1 -x^(2)))", where" |x| lt 1/sqrt3`. Then, the value of y is

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If `tan^(-1) y = tan^(-1) x + tan^(-1)((2x)/(1 -x^(2)))", where" |x| lt 1/sqrt3`.
Then, the value of y is
A. `(3x-x^(2))/(1+3x^(2))`
B. `(3x+x^(2))/(1+3x^(2))`
C. `(3x-x^(2))/(1-3x^(2))`
D. `(3x+x^(2))/(1-3x^(2))`
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Correct Answer - C
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