[Maxima] typo in trigi

[Raymond Toy]

Andreas Eder wrote:
> Hello,
>
> I think there is a typo in trigi.lisp.
> Line 717 reads :
> 	(if (eq (caar y) '%tan) (cadr y) (m- %pi//s (cadr y)))
> %pi//s is undefined - it surely should be either %pi//2 or %pi//4,
>   
Probably %pi//2.  Looks like it's converting cot(x) to tan(%pi/2-x).  Maybe.

Ray