If $ y = (\tan^{-1} x)^2 $,then $ (x^2 + 1)^2 y_2 + 2x(x^2 + 1) y_1 $ is equal to

  • A
    $ 0 $
  • B
    $ 1 $
  • C
    $ 4 $
  • D
    $ 2 $

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