I am struggeling with the following problem: give the x,y,z coordinates from the following ball points/vectors 1. (r, theta, phi) = (sqrt3, 3/4pi, 3/4pi) 2. (r, theta, phi) = (1, 1/6pi, 1 1/6pi) the sollutions I found in my reader are as followed: 1. (x, y, z) = (-1/2 sqrt3, 1/2 sqrt3, -sqrt3/sqrt2) 2. (x, y, z) = 1/4 sqrt3, -1/4, 1/2 sqrt3) can someone explain to me what was actually done here? I understand the conversion from carthesian coordinates to ball and cylinder coordinates but I can't seem to find the sollution for the other way around. Thanks a lot.