If y=(tan^(-1)x)^2 , then prove that (1+...

If `y=(tan^(-1)x)^2` , then prove that `(1+x^2)^2\ y_2+2x\ (1+x^2)y_1=2` .

A

` -2`

B

` 2`

C

` -2x`

D

2x

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The correct Answer is:

B

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