HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 88)

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Derivatives

We will use the Equation Writer to enter the following derivative:

)(

δβα +⋅+⋅ tt

Press ‚O to activate the Equation Writer. Then press ‚¿to enter

the (partial) derivative sign. Notice that the sign, when entered into the

Equation Writer screen, provides input locations for the expression being

differentiated 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

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HP 48gII Graphing Calculator Manual do Utilizador Página 88

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