1.

`sin^(-1)((1-x^(2))/(1+x^(2)))`का मान है ?A. `2 tan ^(-1) x`B. ` pi + tan^(-1) x`C. ` pi/2 - 2 tan ^(-1) x`D. इनमे से कोई नहीं

Answer» Correct Answer - C
माना `x = tan theta`
` :. sin^(-1)((1-x^(2))/(1+x^(2))) = sin^(-1)((1-tan^(2)theta)/(1+tan^(2) theta))`
` = sin^(-1) (cos 2theta) = sin^(-1)[sin(pi/2 - 2 theta)]`
` = pi/2 - 2 theta = pi/2 - 2 tan^(-1) x`


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