Value of tan(pi/8)

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

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

Tap an option to check your answer.