HI,
In the example below, why do I need to explicitely specify the function
variables for atan2 in contrast to atan?
sage: var('z')
sage: f1(z)=2+z; f2(z)=z**2+z+1
sage: arctan(f2/f1)
z|-->arctan((z^2+z+1)/(z+2))
sage: arctan2(f2,f1)
Traceback (click to the left of this block for traceback)
...
TypeError: cannot coerce arguments: no canonical coercion from Callable
function ring with arguments (z,) to Symbolic Ring
But doing this works
sage: arctan2(f2(z),f1(z))
arctan2(z^2+z+1,z+2)
jorge
arctan2(z^2+z+1,z+
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