User:Luosiji/Sandbox/Bingo

$$\left(r\cos({\theta+\phi}), r\sin({\theta+\phi})\right)$$ $$\left(x,y\right)$$ $$r=\sqrt{x^2+y^2}$$ $$\theta=\arctan{\frac{y}{x}}$$ $$\phi\!$$