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September 18, 2014

September 18, 2014

Posted by **Stephanie** on Tuesday, March 22, 2011 at 7:30pm.

#1 cos (27pi/8)

- trig -
**Damon**, Tuesday, March 22, 2011 at 8:17pm27 pi/8 = 3 pi + 3 pi/8

that is 180 degrees + 67.5 degrees

that is in quadrant 3 where cos is negative

so

-cos 3 pi/8 radians

or

-cos 67.5 degrees

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