Find the argument of 1+iroot3 / 1-iroot3

Z = (1 + i sqrt3)/(1 - i sqrt3) = (1 + i sqrt3)^2/(1 - i sqrt3)(1 + i sqrt3)
   = - 1/2 + i sqrt3/2
   = cos(2pi/3) + i sin(2pi/3)
arg(Z) = 2pi/3
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