फलन $y = e^{6x} \cos 3x$ का द्वितीय कोटि का अवकलज ज्ञात कीजिए।

  • A
    $9 e^{6x}(3 \cos 3x - 4 \sin 3x)$
  • B
    $27 e^{6x} \cos 3x - 36 e^{6x} \sin 3x$
  • C
    $9 e^{6x}(4 \cos 3x - 3 \sin 3x)$
  • D
    $27 e^{6x} \cos 3x + 36 e^{6x} \sin 3x$

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