Exact value of a ratio at 15 or 105 degrees

1. A.
   $\dfrac{\sqrt{3} - 1}{2\sqrt{2}}$
2. B.
   $\dfrac{\sqrt{3} + 1}{2\sqrt{2}}$
3. C.
   $\dfrac{1 + \sqrt{3}}{1 - \sqrt{3}}$
4. D.
   $\dfrac{2\sqrt{2}}{\sqrt{3} + 1}$

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1. A.
   $\sqrt{2}$
2. B.
   $-\sqrt{2}$
3. C.
   $\dfrac{1}{\sqrt{2}}$
4. D.
   $-\dfrac{1}{\sqrt{2}}$

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