HP 38g Graphing Calculator - Manual (Page 47)

Indeflnite
Integrals
You can mix formal names and real variables. Evaluating
(A*s2) ^ will substitute a number for A but not for s2.
If you want to evaluate an expression like (sl*s2) ^
numerically, you can do so using the I (where} command,
listed in the MATH menu under the Symbolic category. For
instance, if you wanted si = 3 and s2 = 4, you would enter
(sl*s2) ''2 I (sl=3, s2=4). (The = symbol is in the CHARS
menu: press ■ [CHARS] {{OK}}).
To find the indefinite integral (with a symbolic rather than
numeric result), use formal variables (that is, sO through s5)
for a limit of integration. For instance, to compute
I (6x - 5)dx ,
ehter the integration as / (0, si, 6*x'-5, X).
0 and si are the lower and upper limits, and X is the variable
of integration.
Definite
Integrals
Derivatives
1. Enter the the integration expression in the Home edit line.
(The f symbol in the the CHARS menu.)
2. Press [ENTER], which produces an intermediate result.
3. Press 0 ([COPY]} [ENTER] to complete the evaluation.
The result of /(0,sl,6*X2-5,X) should be
-(5*sl)+6*(s 1^3/3), that is, 2x3-5x.Translators: in Comma
mode; change syntax to use periods.
To find the definite integral (with a numeric result), use
numeric values (numbers or real variables containing
numbers) for both the upper and lower limits. For instance, if
you enter J(-2,3,6*X2-5,X)and press [ENTER] , the result is
45.
To find the symbolic derivative of an expression, use a formal
variable (s 1, etc.) to define the derivative. For example, to
find D/6x*-5x), enter 3sl (6*sl^- 5*sl) .The result is
6*(2*sl) -5, which is equal to 12x—5.
If you use real variables or numbers in the derivative, the
calculator will find a numeric result.
Mathematical Calculations 2-11