# Learning to Graph in my Trig class..

How do you graph y=8cos x on (0,2) on the 48GX...if you show me i can probably figure out the rest...thanks

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### k24674

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• HP Master

Hello,
I do not quite get what you mean by on (0,2), but I will show you the basic steps to graph functions of the type y=f(x).
I will illustrate it with the key sequences on my HP48G.

A. Angle UNIT

1. Since you want to draw the trigonometric functions, you must make sure the angle unit is appropriate. (I will use radians)
2. Press [Right Shift, cyan key] [MODES], use down arrow key to highlight the Angle measure. If angle unit is the correct one, press the [F:OK] key.
3. If it is not, press the [B:Choose] menu item and select the correct angle unit from the list and press [F:OK], and OK again to exit the MODES screen.
B. ENTER FUNCTION

1. Press the [Right Shift, cyan key][8] to access (PLOT).The function entry screen opens and you can verify that the angle unit is the correct one.
2. The function entry line EQ is highlighted.
3. If equations are available in working directory you can use the [B:Choose] menu item. If you want, you can [A:Edit] the equation highlighted, or just enter a new one.
4. Press [EDIT]. The expression is pasted on the EDIT line, just above the menu bar. Pay attention to the two single quotes, do not erase any of them. If you do you will have to enter again the one erased.
5. When you finish editing or entering the expression for the function press [F:OK]
6. Make sure that the dummy variable inside the function is identical to the independent variable highlighted on the third line. Usually it is Capital X, but in some library functions the variable is non-capital x. The two must be the same.
WINDOW
1. Once the independent variable is chosen, use the right arrow key to set the H-View (horizontal dimension of the window). If you want to edit the left x limit press [A:Edit].
2. Accept or edit the window dimensions.
3. You may want to check the AUTOSCALE option. Use arrow to highlight the field left of Autoscale, and press [C:CHK] to put a check mark.
DRAW
To draw the function press [F:Draw] Menu. Wait for the function to be drawn.

Other functionalities are available for the drawn function, but I will not describe them. Remember, you just wanted to get started.

Posted on Nov 08, 2009

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