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jaersyn

  • 2 years ago

sketch the polar equation r = 4sin(t)

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  1. Mathmuse
    • 2 years ago
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    Start with your critical points. 0, pi/2, pi, 3pi/2, 2pi you should be familiar with the values of sin(t) at these points. multiply by 4 and plot the points, connect the point to obtain a rough sketch

  2. jaersyn
    • 2 years ago
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    don't i have to find the rectangular equation for this first?

  3. Mathmuse
    • 2 years ago
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    you can plot it in rectangular coordinates...but since the radius is given in terms of an angle, you can plot it directly to a polar plot

  4. Mathmuse
    • 2 years ago
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    http://www.dryerase.com/Images_2424/LG_U2424.jpg

  5. jaersyn
    • 2 years ago
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    True, can you help me graph it using rectangular coordinates? Haven't gotten around using polor coordinates yet

  6. jaersyn
    • 2 years ago
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    |dw:1355515747517:dw|

  7. phi
    • 2 years ago
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    you could write your rectangular equation as \[x^2 + y^2 +4y =0 \] now complete the square on y

  8. phi
    • 2 years ago
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    although I am not sure where your r= -4 sin \(\theta\) came from Up top, it is r= +4 sin \(\theta\)

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