1.

d/(dx){Cot^(-1)""(sqrt(1+x)-sqrt(1-x))/(sqrt(1+x)+sqrt(1-x))}

Answer»

`1/(SQRT(1-x^2))`
`(-1)/(2(sqrt(1-x^2)))`
`(1)/(sqrt(1+x^2))`
`(-1)/(2(1+x^2))`

ANSWER :B


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