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