HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 434)

PLOTADD(X^2-X) is similar to „ô but adding this function to EQ: X^2 -1.

Using @ERASE @DRAW produces the plot:

TABVAL(X^2-1,{1, 3}) produces a list of {min max} values of the function in the

interval {1,3}, while SIGNTAB(X^2-1) shows the sign of the function in the

interval (-∞,+), with f(x) > 0 in (-∞,-1), f(x) <0, in (-1,1), and f(x) > 0 in (1,+ ∞).

TABVAR(LN(X)/X) produces the following table of variation:

A detailed interpretation of the table of variation is easier to follow in RPN

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HP 48gII Graphing Calculator Manual do Utilizador Página 434