Improper Integrals with the HP-15C LE & CE

[lrdheat]

On my CASIO fx-991CW, using endpoints of 5*10^-19 to 1, the integration, after ~13.4 seconds produces 1.999999999 The CASIO must try using the zero endpoint if the endpoints are entered from 0 to 1 as it will throw a math error. This ~$20 calculator uses 21, sometimes 22 digits in it’s calculations.