David Smith just pointed this out: arcsec(float(.1)) throws an error that doesn't make much sense. Yes, it's outside of the domain, but it should probably deal with this by returning NaN or something rather than a type error. This came up when David was trying to plot arcsec.

On a related note, maybe we should have some sort of error that can be thrown for values outside of domains? Plot could catch an out-of-domain error and break the drawing there, so you wouldn't end up with something like http://sagecell.sagemath.org/?q=llweji

Thanks,

Jason

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