Texas Instruments TI-83 Manual Book page 74

fnInt(
(function integral) returns the numerical integral (Gauss-Kronrod
fnInt(
method) of with respect to , given limit, limit,
expression variable lower upper
and a (if not specified, the default is 1âL5). is valid only for
tolerance fnInt(
real numbers.
[ ]
fnInt( expression , variable , lower , upper , tolerance )
Tip: To speed the drawing of integration graphs (when fnInt( is used in a Y=
equation), increase the value of the Xres window variable before you press
s.
TI-83 Plus Math, Angle, and Test Operations 71