Slow integral evaluation on HP-50g

[Manolo Sobrino]

In EMU48 via EQW it works fine and gets this answer (with 10 accurate digits, pay attention to the graph and check if your Number Format is Standard, because then your goal is 12), but only after a little while and using emulation speed. I guess it's Romberg integration, which suffers if the derivatives of the integrand are not continuous, you see that with a small tolerance. Use Approx mode, and change effectively the tolerance via Number Format -> FIX 5, for instance.

When you have an abs function, look if there are points in the interval with a value that could permit two slopes (for a global abs any root will be ). There's the trouble: at some point it won't converge for a subinterval there.