If $y = \cos (\sin {x^2}),$ then at $x = \sqrt {\frac{\pi }{2}} , \frac{dy}{dx} = $

  • A
    $ -2 $
  • B
    $ 2 $
  • C
    $ -2\sqrt {\frac{\pi }{2}} $
  • D
    $ 0 $

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