If \( \tan 86^{\circ}=m, \operatorname{then} \frac{\tan 176^{\circ}+\cot 4^{\circ}}{m+\tan 4^{\c...

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If \( \tan 86^{\circ}=m, \operatorname{then} \frac{\tan 176^{\circ}+\cot 4^{\circ}}{m+\tan 4^{\circ}} \) is
(a) \( \frac{m^{2}-1}{m^{2}+1} \).
(b) \( \frac{m^{2}+1}{1-m^{2}} \).
(c) \( \frac{1-m^{2}}{1+m^{2}} \).
(d) \( \frac{m^{2}+1}{m^{2}-1} \).
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