Question 737432
at this point, is pi/6 degrees or radians? I assume radians 

tan2(pi/6) = 2 tan (pi/6) / 1- tan(pi/6)^2 

evaluate the right side of the = sign

2*tan(3.14/6) / (1-tan(3.14/6)^2

2*.58 / (1-.58^2) = 1.16 / .66 = .5