यदि $u(n) = \int_0^{\frac{\pi}{2}} (1 + \sin t)^n \sin 2t \, dt$,जहाँ $n \in N$,तो $u(4) = $

  • A
    $\frac{28 \pi}{5}$
  • B
    $\frac{128}{35}$
  • C
    $\frac{129}{15}$
  • D
    $\frac{68 \pi}{15}$

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