$\frac{d}{dx} (\cos 4x^2)$ का मान ....... है।

  • A
    $-2x \sin 4x^5$
  • B
    $-5x \sin 3x^2$
  • C
    $-7x \sin 4x^3$
  • D
    $-8x \sin 4x^2$

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