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यदि `-1 lt xlt 1," तो "2 tan^(-1)x=` ?

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यदि `-1 lt xlt 1," तो "2 tan^(-1)x=` ?
A. `sin^(-1)""(2x)/(1+x^(2))`
B. `sin^(-1)""(2x)/(1-x^(2))`
C. `sin^(-1)""(1-x^(2))/(1+x^(2))`
D. `sin^(-1)""(1+x^(2))/(1-x^(2))`
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Correct Answer - A
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