It's the application of Shrodinger wave equation to H-atom and I can't solve the first step. Please help me solve this. I'm not maths student so it's really hard to solve it:( d^2 psi/dx^2+d^2psi/dy^2+d^2psi/dz^2+8π^2m/h^2(E-V)=0 Where x= rsin(theta)cos(phi) y=rsin(theta)sin(phi) z=rcos(theta) V=-e^2/r When we convert Cartesian plans into polar planes, we get: 1/r^2 . d/dr(r^2.d(psi)/dr)+1/r^2sin(theta) . d/d(theta) (sin(theta).d(psi)/d(theta))+ 1/r^2sin^2(theta). d^2(psi)/d(phi)^2+8π^2m/h^2(E+e^2/r)(psi)=0 Please explain in easy steps, how to solve this?