[Octave-bug-tracker] [bug #37379] atan2 and other trig functions lack documentation

[Rik]

Follow-up Comment #11, bug #37379 (project octave):

I don't think we need to adhere to the GNU spec.  In particular, I think it
would be better to follow what mathematicians do and if they extend the range
of the function with branch cuts or whatever then we can too.  To my simple
mind, the acos() and cos() functions are inverses and that is the property I
expect to hold at all times.  The domain of the function is a secondary
concern to me.

In this case, the inverse property is maintained even though the domain has
been extended.


x = acos (-2)
x =  3.1416 - 1.3170i
cos (x)
ans = -2.0000e+00 + 2.1211e-16i




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