निश्चित समाकलन का मान ज्ञात कीजिए: $\int_0^{\pi /2} \cos^2 x \, dx$

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{\pi}{8}$
  • D
    $\frac{\pi}{6}$

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