# Trigonometry! #28

Geometry Level 4

For a $$\Delta ABC$$,

$$c=3cm$$

$$b=6cm$$

$$\cos(\angle BAC)=\frac {1}{8}$$

Find the length of $$AD$$, the angle bisector of $$\angle BAC$$, such that $$D$$ lies on $$\overline{BC}$$.

This problem is part of the set Trigonometry.

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