HP 48gII Manuale Utente Scaricare il pdf (Pagina 139)

Page 11-4

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

),()()( aFbFdxxf

−=

∫

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,

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HP 48gII Manuale Utente Pagina 139