1.

d/(dx){sec^(-1)""(1)/(sqrt(1-x^2))+cot^(-1)""(sqrt(1-x^2))/x} =

Answer»

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

ANSWER :C


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