Calculator User Manual

TI-83 Plus Math, Angle, and Test Operations 71

fnInt(

(function integral) returns the numerical integral (Gauss-Kronrod

method) of

expression

with respect to

variable

, given

lower

limit,

upper

limit,

and a

tolerance

(if not specified, the default is 1

5).

fnInt(

is valid only for

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