>From a user:

I verified that Sage does what he claims [1].  I guess this is a bug
in Maxima really.

I'm constantly getting basic calculus bug reports because of
SageMathCloud.    We don't have a "sage-bugs" list, and even I'm not
sure where to send these bug reports...

"Hello,

I tried this input in Sage:

limit(csc(x),x=0)

The returned result is:

Infinity

Which is incorrect because limit(csc(x),x=0,dir='right') returns
+Infinity and  limit(csc(x),x=0,dir='left') returns -Infinity.

The limits on the left and on the right of 0 are not equal, which
means the two-sided limit does not exist."


-- 
William (http://wstein.org)

[1] 
https://cloud.sagemath.com/projects/4a5f0542-5873-4eed-a85c-a18c706e8bcd/files/support/2015-02-21-113856.sagews

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