Evaluate Polar Expressions on the TI-83 Plus

You can use the TI-83 Plus graphing calculator to evaluate polar expressions that you have entered and graphed. To evaluate polar equations at a specified value of

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follow these steps:

  1. Graph the equation in a viewing window that contains the specified value of

    image1.png

    To get a viewing window containing the specified value of

    image2.png

    that value must be between

    image3.png

    and

    image4.png
  2. Set the Format menu to ExprOn and CoordOn.

  3. Press [2nd][TRACE] to access the Calculate menu.

  4. Press [1] to select the value option.

  5. Enter the specified value of

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    To do so, use the keypad to enter the value of

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    If you make a mistake when entering your number, press [CLEAR] and re-enter the number.

  6. Press [ENTER].

    After you press [ENTER], the first highlighted polar equation in the Y= editor appears at the top of the screen, the cursor appears on the graph of that equation at the specified value of

    image7.png

    and the coordinates of the cursor appear at the bottom of the screen.

  7. Repeatedly press

    image8.png

    to see the value of the other graphed polar equations at your specified value of

    image9.png

    Each time you press

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    the name of the polar equation being evaluated appears at the top of the screen and the coordinates of the cursor location appear at the bottom of the screen.

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If you’re planning to evaluate polar equations at several specified values of

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consider constructing a user-defined table.

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