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Math Help - Converting Rectangular to Polar

  1. #1
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    Question Converting Rectangular to Polar

    I am having a brain fade today, and just really need to make sure I am doing this correctly.

    i am given ... Convert the rectangular equation x^2 + y^2 - 2y = 0

    I think the answer is -2sin(theta) however I am missing a step to proove it.

    and one other one on the reverse side... convert polar to rectangular

    r = (2/(2sin(theta) - 3cos(theta)))

    I am lost on that one.
    any help is greatly appreciate
    Last edited by mr fantastic; December 8th 2009 at 12:49 PM. Reason: rt --> de
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  2. #2
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    Quote Originally Posted by megabust View Post
    I am having a brain fade today, and just really need to make sure I am doing this correctly.

    i am given ... Convert the rectangular equation x^2 + y^2 - 2y = 0

    I think the answer is -2sin(theta) however I am missing a step to proove it.

    and one other one on the reverse side... convert polar to rectangular

    r = (2/(2sin(theta) - 3cos(theta)))

    I am lost on that one.
    any help is greatly appreciate
    Straight forward substitution: r^2 - 2r \sin \theta = 0. Therefore ....
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  3. #3
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    I guess I assumed since it was easy that I was missing something.

    And on the second one I figured out that I just multiply by the denom to get the form I need ... thanks for your help.
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