HP 48GII, Руководство пользователя, Страница: 90 / 864

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This indicates that the general expression for a derivative in the line editor or
in the stack is:
∫
( lower_limit, upper_limit,integrand,variable_of_integration )
Press
`
to return to the Equation Writer. The resulting screen is not the
definite integral we entered, however, but its symbolic value, namely,
To recover the derivative expression use
‚¯
. To evaluate the derivative
again, you can use the
D
soft menu key. This shows again that
) cos( ) sin( ) sin(
0
τ τ τ
τ
⋅ − = ⋅ ⋅
∫
dt t t
Double integrals are also possible. For example,
which evaluates to 36. Partial evaluation is possible, for example:
This integral evaluates to 36.
Organizing data in the calculator
You can organize data in your calculator by storing variables in a directory
tree. To understand the calculator’s memory, we first take a look at the file
directory. Press the keystroke combination
„¡
(first key in second row
of keys from the top of the keyboard) to get the calculator’s File Manager
screen: