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If \( \frac{\cos (\theta-\alpha)}{\sin (\theta+\alpha)}=\frac{m+1}{m-1} \), then \( m \) is equal to
(a) \( \tan \left(\frac{\pi}{4}-\theta\right) \tan \left(\frac{\pi}{4}-\alpha\right) \)
(b) \( \tan \left(\frac{\pi}{4}-\theta\right) \tan \left(\frac{\pi}{4}+\alpha\right) \)
(c) \( \tan \left(\frac{\pi}{4}+\theta\right) \tan \left(\frac{\pi}{4}+\alpha\right) \)
(d) \( \tan \left(\frac{\pi}{4}+\theta\right) \tan \left(\frac{\pi}{4}-\alpha\right) \)
\( \mathrm{P} \)
W
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