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and the variable of differentiation. To fill these input locations, use the following
keystrokes:
~„t™~‚a*~„tQ2
™™+~‚b*~„t+~‚d
The resulting screen is the following:
To see the corresponding expression in the line editor, press ‚— and the
A soft menu key, to show:
This indicates that the general expression for a derivative in the line editor or in
the stack is:
∂variable(function of variables)
Press ` to return to the Equation Writer. The resulting screen is not the
derivative 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
.
Second order derivatives are possible, for example:
which evaluates to:
βαδβα
+⋅=+⋅−⋅ ttt
dt
d
2)(
2