Slow integral evaluation on HP-50g

[kakima]

My 50g comes up with an answer of about 12.5733 in STD display after the maximum 64K-1 function evaluations. It comes up with 12.5726 in 4 FIX after only 63 evaluations.

I suspect the noncontinuous derivatives at about x=5.2 has a lot to do with it. Removing the ABS, it comes up with a result after 255 evaluations in STD.