The usual principal values of the arctan(x) and arccot(x) functions graphed on the cartesian plane.
y x = arctan(y)
degrees radians
-1.732050808 -60° -π/3
-1.000000000 -45° -π/4
-0.577350269 -30° -π/6
0 0° 0
0.577350269 30° π/6
1.000000000 45° π/4
1.732050808 60° π/3
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