# Tips & tricks

## Good points to remember (Cheat Sheet)

**Input**:

- Capital letters matter: X is not the same as x.
**Space**can be a multiplication sign: ax in y = ax + b is interpreted as a new, previously undefined variable. Instead, use y = a x + b or y = a*x + b.- Use
**up**and**down**arrows in the input bar to scroll through previous commands. - Pressing
**Enter**will move the text cursor to the input bar. **F3**will copy a selected object's definition to the input bar for easy redefinitions.- The input help is found under the little triangle to the right of the input bar.

**Sliders**:

- Use
**Arrow keys**to control sliders, numbers and points. - Set the increment in the
**Properties dialogue**, on the Slider tab. - Use
**Shift-Arrow**for fine-tuning with 1/10 of the increment. - Use
**Ctrl-Arrow**for larger jumps with 10x the increment. - Use
**Alt-Arrow**for really large jumps with 100x the increment.

**Points, lists, and commands**:

- Points are written within parentheses: (3,5), (4.7,3.52), (a,f(a))…
- x(A) and y(A) returns the x- and y-coordinates for point A.
- Lists are written within curly braces: data = {A,B,C,D,E}.
- Commands have square brackets and capitals: Intersect[f,g] but ordinary parentheses are also allowed: Intersect(f,g).

**Alt key**:

**Alt-a**gives, **Alt-b**gives, etc. **Alt-o**gives the degree sign 360°.**Alt-i**gives you the imaginary unit*i*,**Alt-p**gives, and **Alt-e**gives*e*= 2,718…**Alt-2**,**Alt-3**… give you whole number powers. Use ^2.5 for other powers.- Indexes are typed with an
__underscore__: S_1 =. - Special characters are found under the alpha sign to the right in the input bar

**Graphics window**:

- The axes have names:
**xAxis**and**yAxis**. - x(P) and y(P) gives you the coordinates of the point P.
**Ctrl-Drag**the axes to zoom and**Drag**the background to pan.**Escape**de-selects any selected objects and activates the selection tool (the arrow).

**Objects**:

- Rename objects immediately after creation by just starting to type the name.
- Double-click objects to redefine them
**Drag**from the Algebra window to the Graphics window to create a text label.- Hide or show objects by clicking the visibility button in the Algebra window.

**Miscellaneous**:

**Ctrl-F**will erase tracks from tracing objects.**F9**will recalculate random numbers**Ctrl-Shift-S**opens the spreadsheet.**Ctrl-Shift-2**opens Graphics Window 2.**View > Keyboard**to get a virtual keyboard on-screen.

**Help**-menu.

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