The ZStandard, ZDecimal, ZTrip, and ZQuadrant1 zoom commands help you initially graph or regraph your function in a preset viewing window. To use these zoom commands, enter your function into the calculator, press [ZOOM], and then press the key for the number of the command. The graph automatically appears.

## ZStandard zoom command on the TI-84 Plus

This command graphs your function in a preset viewing window where

You access it by pressing [ZOOM][6]. See the first screen.

This Zoom command is the best way to begin graphing. After graphing the function using **ZStandard**, you can, if necessary, use the **Zoom In** and **Zoom Out** commands to get a better idea of the nature of the graph.

## ZDecimal zoom command on the TI-84 Plus

This command graphs your function in a preset viewing window where

The **ZDecimal** command is accessed by pressing [ZOOM][4].

When you trace a function graphed in a **ZDecimal **window, the *x*-coordinate of the Trace cursor will be a multiple of 0.1.

## ZTrig zoom command on the TI-84 Plus

This command, which is most useful when graphing trigonometric functions, graphs your function in a preset viewing window where

It also sets the tick marks on the *x*-axis to multiples of π/2. You access **ZTrig** by pressing [ZOOM][7]. See the second screen.

When you trace a function graphed in a **ZTrig** window, the *x*-coordinate of the Trace cursor will be a multiple of π/24.

## ZQuadrant1 zoom command on the TI-84 Plus

This command graphs your function in a preset viewing window where

Of course, only Quadrant I can be viewed in this window. It is accessed by pressing [ZOOM][ALPHA][MATH], or by pressing [ZOOM] and using the up-arrow key to scroll to **ZQuadrant1**. See the third screen.

When you trace a function graphed in a **ZQuadrant1 **window, the *x*-coordinate of the Trace cursor will be a multiple of 0.1.