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Math Help - Graphing w/TI-85 and polar coordinates

  1. #1
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    Graphing w/TI-85 and polar coordinates

    Does anyone know how to graph this:

    Inside r=a(1+cos pheta) and outside r=a cos pheta

    Thanks!
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  2. #2
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    Quote Originally Posted by Possible actuary View Post
    Does anyone know how to graph this:

    Inside r=a(1+cos pheta) and outside r=a cos pheta

    Thanks!
    I used Maple to graph the curves (letting a=2)

    a:=2:
    plot([a*(1+cos(theta)),a*cos(theta)],theta=0..2*Pi,
    coords=polar,thickness=3,color=[red,blue]);
    Attached Thumbnails Attached Thumbnails Graphing w/TI-85 and polar coordinates-july22.gif  
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  3. #3
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    Quote Originally Posted by Possible actuary View Post
    Does anyone know how to graph this:

    Inside r=a(1+cos pheta) and outside r=a cos pheta

    Thanks!
    Hello,

    1. you have to switch your calculator to polar mode.

    2. Enter the equations at r1 and r2 in the y-editor. You'll find the \theta at the \boxed{X,T,\theta,n}-key of your calculator.

    3. Use the following window-settings:
    \thetamin = 0
    \thetamax = 6.2831... the means it is 2 \pi
    \thetastep = .1308996... that means it is \frac{\pi}{24}
    xmin = -2
    xmax = 5
    xscl = 1
    ymin = -3
    ymax = 3
    yscl = 1

    4. I've attached the drawing.

    5. I used a TI84 and I hope that the syntax is the same with a TI85. If not

    Remark: Unfortunately the factor 2 is hidden by the cursor in the equation r1
    Attached Thumbnails Attached Thumbnails Graphing w/TI-85 and polar coordinates-polfunc_ti84.jpg  
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