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If y=(tan^-1x)^2 then (x^2+1)^2(d^2y)/...

If `y=(tan^-1x)^2` then
`(x^2+1)^2(d^2y)/(dx^2)+2x(x^2+1)(dy)/(dx)`=

A

4

B

2

C

1

D

0

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