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IF y= ( tan ^(-1) x)^(2) " then " (x^...

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

A

4

B

2

C

1

D

0

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