tan(x) = 0
pi x + y = -- 3
x + y = pi/3
0
1.04719755119660
x1 = 6.283185307179586 y1 = -5.235987755982989
x2 = -6.283185307179586 y2 = 7.330382858376184
x3 = -9.42477796076938 y3 = 10.47197551196598
x4 = 3.141592653589793 y4 = -2.094395102393195
x5 = 9.42477796076938 y5 = -8.377580409572782
x6 = -3.141592653589793 y6 = 4.188790204786391
x6 = -3.141592653589793 y6 = 4.188790204786391