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Math Help - Polar r=2+3sinΘ

  1. #1
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    Exclamation Polar r=2+3sinΘ

    So in calculus 2 they have this problem that I am just stuck with

    r=2+3sinΘ
    I multiply both sides by r
    r^2 = 2r + 3rsinΘ
    that turns to be
    x^2 + y^2 = 2r + 3y

    x^2 + y^2 - 3y = 2r

    how do I get rid of the last r?
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  2. #2
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    Quote Originally Posted by fhtapia View Post
    So in calculus 2 they have this problem that I am just stuck with

    r=2+3sinΘ
    I multiply both sides by r
    r^2 = 2r + 3rsinΘ
    that turns to be
    x^2 + y^2 = 2r + 3y

    x^2 + y^2 - 3y = 2r

    how do I get rid of the last r?
     <br />
r = \sqrt{x^2+y^2}<br />
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