1.

If y= tan^(-1)sqrt((1-x)/(1+x)) then dy/dx at

Answer»

`(-1)/(2|x|sqrt(x^2-1))`
`(-1)/(2xsqrt(x^2-1))`
`(1)/(2xsqrt(x^2-1))`
`(1)/(2xsqrt(x^2+1))`

ANSWER :A


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