atan2(y, x)This calls Python's built-in math.atan2 function, which computes the arc tangent of $frac{y}{x}$ between $-\pi$ and $\pi$.
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If one of the arguments is a Macaulay2 object, then it is first converted to a Python object before computing the arc tangent.
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The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/Python/doc/trig.m2:109:0.