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How do I draw a graph for this???

I am given this function and I have to change it in order to plot the graph but the thing is, I am stucked and I don't know where to start.

(x^2+y^2)(x+y)=2axy

and I have the answer for the graph table,

Attachment 23289

but I have no idea how to get the answer :(

Re: How do I draw a graph for this???

What you have written makes no sense. The formula you give is in x and y and has the parameter "a". But the values you give are for r and theta and have no "a". I did not check to see if changing to polar coordinates gives those values for any a but certainly do not have an "a".