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19.
y^2 =x^3
In polar coordinates, x=r*cos(θ) and y=r*sin(θ).
Thus, the input can be rewritten as
r^2sin^2(θ)=r^3cos^3 (θ)
r^2sin^2(θ)-r^3cos^3 (θ)=0
Simplify:
r^2(sin^2(θ)-rcos^3(θ))=0
20.
y=x^2
In polar coordinates, x=rcos(θ) and y=rsin(θ).
Thus, the input can be rewritten as
rsin(θ)=(rcos (θ))^2
rsin(θ)=r^2cos^2 (θ)
sin(θ)=rcos^2 (θ)
r=sin(θ)/cos^2(θ)