HP 48gII User Manual
Page 451
Page 13-16
 
At this point, you can press 
` to return the integral to the stack, which will
show the following entry (ALG mode shown): 
 
 
This is the general format for the definite integral when typed directly into the 
stack, i.e., 
∫ (lower limit, upper limit, integrand, variable of integration)
Pressing
` at this point will evaluate the integral in the stack:
 
The integral can be evaluated also in the Equation Writer by selecting the 
entire expression an using the soft menu key 
@EVAL.
 
Step-by-step evaluation of derivatives and integrals 
With the Step
/
Step option in the CAS MODES windows selected (see Chapter
1), the evaluation of derivatives and integrals will be shown step by step. For 
example, here is the evaluation of a derivative in the Equation Writer: