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5.18.2  Table of variations of a function: tabvar

The tabvar command takes one mandatory argument and one optional argument. The mandatory argument is an expression of a single variable, and the second argument is the variable.
tabvar returns the table of variations of the function f(x) = expr and draws the graph on the DispG screen, accessible with the menu CfgShowDispG.

Input:

tabvar(x^2 - x - 2,x)

Output:

Input:

tabvar((2*t-1)/(t-1),t)

Output:

Note that in this case, the value 1 appears twice in the first row, so that both one-sided limits of y can be displayed at the vertical asymptote t=1. The values of 2 for y at −∞ and ∞ indicate a horizontal asymptote of y=2.


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