HP 35s Scientific Calculator - Manual (Page 139)

Integrating Equations 8-5
Enter the expression that defines the integrand's function:
If the calculator attempted to evaluate this function at x = 0, the lower limit of
integration, an error (  ) would result. However, the integration
algorithm normally does not evaluate functions at either limit of integration, unless
the endpoints of the interval of integration are extremely close together or the
number of sample points is extremely large.
Now integrate this function with respect to x (that is, X) from zero to 2 (t = 2).
Keys: Display: Description:
   
   Selects Equation mode.
X  Starts the equation.
Õ
_
The closing right parenthesis is
required in this case.
X
_
  Terminates the equation.
 
 Checksum and length.
 Leaves Equation mode.
Keys: Display: Description:
9
()
Selects Radians mode.
X

_
Enters limits of integration (lower
first).


Displays the current equation.
 X 
∫ 

Calculates the result for Si(2).
x
x sin