On Fri, Jun 08, 2018 at 03:55:34PM +1000, Chris Angelico wrote:
On Fri, Jun 8, 2018 at 3:45 PM, Steven D'Aprano <steve@pearwood.info> wrote:
Although personally I prefer the look of d as a prefix:
dsin, dcos, dtan
That's more obviously pronounced "d(egrees) sin" etc rather than "sined" "tanned" etc.
Having it as a suffix does have one advantage. The math module would need a hyperbolic sine function which accepts an argument in; and then, like Charles Napier [1], Python would finally be able to say "I have sindh".
Ha ha, nice pun, but no, the hyperbolic trig functions never take arguments in degrees. Or radians for that matter. They are "hyperbolic angles", which some electrical engineering text books refer to as "hyperbolic radians", but all the maths text books I've seen don't call them anything other than a real number. (Or sometimes a complex number.) But for what it's worth, there is a correspondence of a sort between the hyperbolic angle and circular angles. The circular angle going between 0 to 45° corresponds to the hyperbolic angle going from 0 to infinity. https://en.wikipedia.org/wiki/Hyperbolic_angle https://en.wikipedia.org/wiki/Hyperbolic_function
[1] Apocryphally, alas.
Don't ruin a good story with facts ;-) -- Steve