निरीक्षण विधि का उपयोग करके निम्नलिखित फलन के लिए एक प्रति-अवकलज (anti-derivative) ज्ञात कीजिए:
$\cos 2x$

  • A
    $\frac{1}{2} \sin 2x$
  • B
    $-\frac{1}{2} \sin 2x$
  • C
    $2 \sin 2x$
  • D
    $-2 \sin 2x$

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