For unit vectors a and b at angle theta: |a + b| / |a - b| in terms of theta

1. A.
   $|\overline{a} - \overline{b}|$
2. B.
   $|\bar{a} + \bar{b}|$
3. C.
   $\frac{|\overline{a} + \overline{b}|}{|\overline{a} - \overline{b}|}$
4. D.
   $\frac{|\overline{a} - \overline{b}|}{|\overline{a} + \overline{b}|}$

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1. A.
   $\tan\dfrac{\theta}{2}$
2. B.
   $\sin\dfrac{\theta}{2}$
3. C.
   $\cos\dfrac{\theta}{2}$
4. D.
   $\cot\dfrac{\theta}{2}$

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