(a) Find the Cartesian components of the position vector whose spherical polar coordinates are r = 2.00, = 90 , = 0

(a) Find the Cartesian components of the position vector whose spherical polar coordinates are r = 2.00, θ = 90^◦, ϕ = 0^◦. Call this vector A.
(b) Find the scalar product of the vector A from part a and the vector B whose Cartesian components are (1.00,2.00,3.00).
(c) Find the angle between these two vectors.