Posted by **Anonymous** on Sunday, August 23, 2009 at 10:37pm.

use specific triangles and the unit circle to geth the values.

tan(5pi/6?)

- Trig.... -
**Reiny**, Sunday, August 23, 2009 at 11:05pm
5pi/6 or 150º has a reference angle of pi/6 or 30º

So you are dealing with the 30,60,90º triangle, resulting in that triangle constructed in the second quadrant.

In the second quadrant the tangent is negative, and since tan pi/6 = 1/√3

tan (5pi/6) = -1/√3

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