CartToPol(x=1, y=1)
CartToPol(x=c(1,2,3), y=c(1,1,1))
CartToPol(x=c(1,2,3), y=1)
PolToCart(r=1, theta=pi/2)
PolToCart(r=c(1,2,3), theta=pi/2)
CartToSph(x=1, y=2, z=3) # r=3.741657, theta=0.930274, phi=1.107149
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