\( \cos 2 x-3 \cos x+1=\frac{1}{(\cot 2 x-\cot x) \sin (x-\pi)} \) holds, if
(a) \( \cos x=0 \)
...
\( \cos 2 x-3 \cos x+1=\frac{1}{(\cot 2 x-\cot x) \sin (x-\pi)} \) holds, if
(a) \( \cos x=0 \)
(b) \( \cos x=1 \)
(c) \( \cos x=5 / 2 \)
(d) for no value of \( x \)
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