Transpose Polar to Cartesian Coordinate Systems
Find the Cartesian coordinate system of :
r=1/[3-3cos(t)]
3r-3*r*cos(t)=1
3*sqrt[x^2+y^2]-3x=1
3*sqrt(x^2+y^2)=3x+1
squared for both sides :
9*[x^2+y^2]=9x^2+6x+1
9x^2+9y^2=9x^2+6x+1
9y^2=6x+1
y^2=(6x+1)/9 is the final answer
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