The integral of a derivative should return the same expression, or maybe, different by adding a constant. Try something simple,

diff(2*arcsinh(x^(3/2)/sqrt(2))/3,x);

                               1/2  1/2
                              2    x
                            -------------
                                    3 1/2
                            (4 + 2 x )

int(%,x);

The answer is too long to paste, and I didn't check whether it is correct, or wrong.

Alec

Sage has a group on Facebook now. I've just became a fan.

Alec

Recently this site became very slow. It takes a few minutes to get a page after clicking on a link. Search is very slow as well. Sometimes I couldn't get the resulting page at all - for example, searching for "digits".

Alec

Wolfram Alpha is launching in May - that looks interesting.

Alec

Titlefont affects other text elements in an animation. Here is an example.

First, without an animation (works OK, ignoring such things as the plot being higher at 0 than it should, having too many ticks on the y axis, the plot being located too far from the title etc., which are different topics),