Here I am doing a spherical pendulum problem, and i was asked to represent the unit vectors of spherical coor in terms of Cartesian coor, which i have already solved:
r=sinθcosφ i + sinθsinφ j + cosθ k
θ=cosθcosφ i + cosθsinφ j - sinθ k
φ= -sinφ i + cosφ j
where φ is the angle on the X-Y...