$\int_0^{\pi / 2} \sqrt{\sin \theta} \cos ^3 \theta d \theta$ का मान ज्ञात कीजिए।

  • A
    $\frac{8}{23}$
  • B
    $\frac{7}{23}$
  • C
    $\frac{8}{21}$
  • D
    $\frac{7}{21}$

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