\( \mathrm{MN} \) is a vertical pole. The end \( \mathrm{M} \) is on the ground, \( \mathrm{C} \...

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\( \mathrm{MN} \) is a vertical pole. The end \( \mathrm{M} \) is on the ground, \( \mathrm{C} \) is the middle point of \( \mathrm{MN} \), and \( \mathrm{P} \) is a point on the level ground. The portion NC subtends an angle \( \alpha \) at \( \mathrm{P} \). If \( \mathrm{MP}=\mathrm{n} \mathrm{MN} \), then \( \tan \alpha \) is
- a. \( \frac{\mathrm{n}}{2 \mathrm{n}^{2}+1} \)
b. \( \frac{\mathrm{n}}{\mathrm{n}^{2}-1} \)
c. \( \frac{2 n}{2 n^{2}+1} \)
d. \( \frac{\mathrm{n}^{2}-1}{\mathrm{n}^{2}+1} \)
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