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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Originally Posted by cmr7 How about x^2 + 2xy + y^2 =9 Can someone show me this step by step? Thank you so much, Caleb Substitute $\displaystyle x = r \cos \theta$ and $\displaystyle y = r \sin \theta$ and simplify. Note that $\displaystyle x^2 + y^2 = r^2$.
Thank You Mr. Fantastic!!
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