2 + \sqrt{2}
2 + \sqrt{3}
2 - \sqrt{2}
1 + 2\sqrt{2}
Correct answer is A
\sin 45 = \frac{\sqrt{2}}{2}
\frac{1}{1 - \sin 45} = \frac{1}{1 - \frac{\sqrt{2}}{2}}
\frac{2}{2 - \sqrt{2}} = \frac{4 + 2\sqrt{2}}{4 - 2}
= 2 + \sqrt{2}
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