$\frac{d^{20}}{dx^{20}}(2\cos x \cos 3x)$ का मान ज्ञात कीजिए।

  • A
    $2^{20}(\cos 2x - 2^{20}\cos 4x)$
  • B
    $2^{20}(\cos 2x + 2^{20}\cos 4x)$
  • C
    $2^{20}(\sin 2x + 2^{20}\sin 4x)$
  • D
    $2^{20}(\sin 2x - 2^{20}\sin 4x)$

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