If \( \cot ^{3} \alpha+\cot ^{2} \alpha+\cot \alpha=1 \) then
(A) \...
If \( \cot ^{3} \alpha+\cot ^{2} \alpha+\cot \alpha=1 \) then
(A) \( \cos 2 \alpha \cdot \tan \alpha=-1 \)
(B) \( \cos 2 \alpha \cdot \tan \alpha=1 \)
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(C) \( \cos 2 \alpha-\tan 2 \alpha=1 \)
(D) \( \cos 2 \alpha-\tan 2 \alpha=-1 \)
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