$\frac{1}{\sin 1^{\circ} \sin 2^{\circ}}+\frac{1}{\sin 2^{\circ} \sin 3^{\circ}}+\ldots+\frac{1}{\sin 89^{\circ} \sin 90^{\circ}} = $

  • A
    $\frac{\cos 1^{\circ}}{\sin 1^{\circ}}$
  • B
    $\frac{\cos 1^{\circ}}{\sin ^2 1^{\circ}}$
  • C
    $\frac{\sin 1^{\circ}}{\cos 1^{\circ}}$
  • D
    $\frac{\sin ^2 1^{\circ}}{\cos 1^{\circ}}$

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