$\int_0^{\pi /2} {\sqrt {\cos \theta } {{\sin }^3}\theta } \,d\theta = $

  • A
    $\frac{20}{21}$
  • B
    $\frac{8}{21}$
  • C
    $-\frac{20}{21}$
  • D
    $-\frac{8}{21}$

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