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If y= tan^(-1) x , then :...

If ` y= tan^(-1) x ` , then :

A

`(1+ x^(2)) (d^(2) y)/(dx^(2)) + 2x""(dy)/(dx) =0`

B

`sqrt((1-x^(2)) (d^(2) y)/(dx^(2)) + 2x ""(dy)/(dx)) =0`

C

`(1- x^(2)) (d^(2) y)/(dx^(2)) + 2x""(dy)/(dx) =0`

D

`sqrt((1+x^(2)) (d^(2) y)/(dx^(2)) + 2x ""(dy)/(dx)) =0`

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