How do I specify a lateral limit?

>>>>> "Daniel" == Daniel Lemire <daniel.lemire@acadiau.ca> writes:

    Daniel> (C1)  limit(tan(x),x,%PI/2,MINUS);
    Daniel> (D1)                                 INF
    Daniel> (C2)  limit(tan(x),x,%PI/2,PLUS);

    Daniel> (D2)                                MINF

You really need to quote the MINUS and PLUS:

(C1) plus:18;

(D1) 				      18
(C2) limit(tan(x),x,%pi/2,plus);

Fourth argument must be either PLUS or MINUS - LIMIT
 -- an error.  Quitting.  To debug this try DEBUGMODE(TRUE);)
(C3) limit(tan(x),x,%pi/2,'plus);

(D3) 				     MINF

Ray