Hi, im having trouble with spherical coordinates. For example, how do you express the unit vectors x hat, y hat, z hat in terms of the spherical unit vectors r hat, theta hat, phi hat. I was able to go from spherical in terms of cartesian (with the help of mathworld.wolfram.com) but I cant get the other way. All i can think of is dR/dx / [dR/dx] = x hat where R is the position vectors in terms of spherical coords. I dont fully understand this but i saw this done as a derivation of theta hat in terms of x,y,z hat. So any suggestions?