\( \sum_{\mathrm{k}=1}^{88}(-1)^{\mathrm{k}+1} \frac{1}{\sin ^{2}(\...
\( \sum_{\mathrm{k}=1}^{88}(-1)^{\mathrm{k}+1} \frac{1}{\sin ^{2}(\mathrm{k}+1)^{\circ}-\sin ^{2} 1^{\circ}} \) is equal to
(W)
(A) \( \tan 2^{\circ} \)
(B) \( \cot 2^{\circ} \)
(C) \( \frac{\sin 2^{\circ}}{\cot 2^{\circ}} \)
(D) \( \frac{\cot 2^{\circ}}{\sin 2^{\circ}}- \)
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