मान लीजिए $I_n = \int_0^{\pi / 2} x^n \cos x \, dx$,जहाँ $n$ एक अ-ऋणात्मक पूर्णांक है। तो,$\sum_{n=2}^{\infty} \left( \frac{I_n}{n!} + \frac{I_{n-2}}{(n-2)!} \right)$ का मान ज्ञात कीजिए।

  • A
    $e^{\pi / 2} - 1 - \frac{\pi}{2}$
  • B
    $e^{\pi / 2} - 1$
  • C
    $e^{\pi / 2} - \frac{\pi}{2}$
  • D
    $e^{\pi / 2}$

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