Add fractions with 1 + cos x and 1 - cos x (or 1 + sin) denominators

1. A.
   $\sqrt{2}$
2. B.
   $2\sqrt{2}$
3. C.
   $\sqrt{2} \tan x$
4. D.
   0

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1. A.
   $\operatorname{cosec}\theta$
2. B.
   $\sec\theta$
3. C.
   $\sec\theta + \operatorname{cosec}\theta$
4. D.
   $\operatorname{cosec}\theta - \cot\theta$

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