By same token, visit the MedCalc [Microsoft Partner]. The on-line calculator
is free to use but the complete installation is $445. A nice companion to
Smath for spot checking. I'm still puzzled why Si(x) breaks to plot around
0 at high 'N'. In the low range near 0: decrease 'N'.

Incremental Analysis works well.

Jean

Maths Incremental Analysis [Power Series].sm (22 KiB) downloaded 88 time(s).