1.

(d)/(dx ) " Tan ^(-1) (1)/(x ^(2) -1) }=

Answer»

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

ANSWER :A


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