To calculate a definite integral, follow these steps.

1.    Press b Ÿ.

2.    Press the down arrow key ≥ to 4: fnInt( to insert the definite integral template.

3.    Press =.

4.    Input the lower and upper boundaries and the integrand and variable of integration, using the arrow keys to navigate between the entry fields.

5.    Press = to evaluate the definite integral.

This computes the numerical integral of a function over an interval.