निरीक्षण विधि द्वारा फलन $\cos 3x$ का प्रति-अवकलज (या समाकल) ज्ञात कीजिए।

  • A
    $\frac{1}{3} \sin 3x$
  • B
    $\frac{1}{3} \cos 3x$
  • C
    $\frac{1}{3} \sin x$
  • D
    $\sin 3x$

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