यदि $\frac{1}{\sin 45^{\circ} \sin 46^{\circ}}+\frac{1}{\sin 46^{\circ} \sin 47^{\circ}}+\ldots$ $45$ पदों तक $=\frac{1}{\sin x^{\circ}}$ है,तो $\sin \left(\frac{\pi}{2} x\right)=$

  • A
    $0$
  • B
    $\sin 1$
  • C
    $1$
  • D
    $\cos 1$

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