Trigonometry! #28

Geometry Level 4

For a ΔABC\Delta ABC,

c=3cmc=3cm

b=6cmb=6cm

cos(BAC)=18\cos(\angle BAC)=\frac {1}{8}

Find the length of ADAD, the angle bisector of BAC\angle BAC, such that DD lies on BC\overline{BC}.

This problem is part of the set Trigonometry.

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