\( \cos ^{2} x-2 \cos x=4 \sin x-\sin 2 x \) if....
\( \cos ^{2} x-2 \cos x=4 \sin x-\sin 2 x \) if
(1) \( \tan (x / 2)=-1 / 2 \)
\( \mathrm{P} \)
(2) \( \tan x=-1 / 2 \)
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(3) \( \tan (x / 2)=2+\sqrt{5} \)
(4) \( \tan (x / 2)=2-\sqrt{5} \)
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