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Definite Integrals - HP 48gII User Manual

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Please notice that functions SIGMAVX and SIGMA are designed for
integrands that involve some sort of integer function like the factorial (!)
function shown above. Their result is the so-called discrete derivative, i.e.,
one defined for integer numbers only.

Definite integrals

In a definite integral of a function, the resulting anti-derivative is evaluated at
the upper and lower limit of an interval (a,b) and the evaluated values
subtracted. Symbolically, we write
b
=
f
(
x
)
dx
F
(
b
)
F
(
a
),
a
where f(x) = dF/dx.
To calculate definite integrals of functions using the CAS variable VX (typically,
'X'), use function PREVAL(f(x),a,b). For example,
Page 11-4

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