Updates:
Labels: smichr NeedsReview
Comment #2 on issue 1447 by [email protected]: limit(tan(x),x,pi/2,dir='-')
returns tan(pi/2)
http://code.google.com/p/sympy/issues/detail?id=1447
In commit 1447 of smichr's github branch 2084 cot and tan are handled
heuristically in limit() to give +/-oo:
h[1] >>> limit(tan(x), x, pi/2)
-oo
h[2] >>> limit(tan(x), x, pi/2, dir='-')
oo
h[3] >>> limit(cot(x), x, pi/2)
0
h[4] >>> limit(cot(x), x, pi)
oo
h[4] >>> limit(cot(x), x, pi, dir='-')
-oo
[ https://github.com/sympy/sympy/pull/61 ]
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