HP 49g+, Руководство пользователя, Страница: 86 / 862

Page 2-31
β α δ β α + ⋅ = + ⋅ − ⋅
t t t
dt
d
2 ) (
2
.
Second order derivatives are possible, for example:
which evaluates to:
Note
: The notation
( )
x
∂
∂
is proper of partial derivatives. The proper
notation for total derivatives (i.e., derivatives of one variable) is
( )
dx
d
. The
calculator, however, does not distinguish between partial and total
derivatives.
Definite integrals
We will use the Equation Writer to enter the following definite
integral:
∫
⋅ ⋅
τ
0
) sin(
dt t t . Press
‚O
to activate the Equation Writer.
Then press
‚ Á
to enter the integral sign. Notice that the sign, when
entered into the Equation Writer screen, provides input locations for the limits
of integration, the integrand, and the variable of integration. To fill these
input locations, use the following keystrokes:
0™~‚u™~ „
t*S~„t™~„t
. The resulting screen is the following:
To see the corresponding expression in the line editor, press
——
and the
A
soft menu key, to show: