माना $z = \cos \theta + i \sin \theta$ है। तब,$\theta = 2^{\circ}$ पर $\sum_{m=1}^{15} \text{Im}(z^{2m-1})$ का मान क्या है?

  • A
    $\frac{1}{\sin 2^{\circ}}$
  • B
    $\frac{1}{3 \sin 2^{\circ}}$
  • C
    $\frac{1}{2 \sin 2^{\circ}}$
  • D
    $\frac{1}{4 \sin 2^{\circ}}$

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