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Math Help - Rectangular into polar form

  1. #1
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    Rectangular into polar form

    How about x^2 + 2xy + y^2 =9

    Can someone show me this step by step?

    Thank you so much,
    Caleb
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  2. #2
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    Quote Originally Posted by cmr7 View Post
    How about x^2 + 2xy + y^2 =9

    Can someone show me this step by step?

    Thank you so much,
    Caleb
    Substitute x = r \cos \theta and y = r \sin \theta and simplify. Note that x^2 + y^2 = r^2.
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  3. #3
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    Thank You Mr. Fantastic!!
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