If \( \sec \alpha+\tan \alpha=m \), then \( \sec ^{4} \alpha-\tan ^{4} \alpha-2 \) \( \sec \alph...
If \( \sec \alpha+\tan \alpha=m \), then \( \sec ^{4} \alpha-\tan ^{4} \alpha-2 \) \( \sec \alpha \tan \alpha \) is
(a) \( m^{2} \)
(b) \( -m^{2} \)
(c) \( \frac{1}{m^{2}} \)
(d) \( \frac{-1}{m^{2}} \)
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