In three-dimensional Euclidean space R3, write down expressions for the change of coordinates from Cartesian coordinates [xa]=(x,y,z) to spherical polar coordinates [x′a]=(r,θ,ϕ). Obtain expressions for the transformation and inverse transformation matrices in terms of the primed coordinates. By calculating the Jacobians J and J′ for the transformation and its inverse, find where the transformation is non-invertible.