# Arctan(tan(2pi/3))

i know it looks like the short cut is applicable here. But isn't there a second point on the unit circle with the same tangent as 2pi/3?
**Tan(2pi/3)= -(Sqr.rt. 3)**
There are other places with the same value for tangent. 5pi/3
**Tan(5pi/3)= -(Sqr.rt. 3)**