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x=rcos(θ)
y=rsin(θ)
なので、
r=√(x^2+y^2)
cos(θ)=x/r
sin(θ)=y/r
です
rsin^2θ+sinθ=r
sinθ(rsinθ+1)=r
y(y+1)/r=r
y(y+1)=x^2+y^2
y=x^2
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