# Deriving the square angular momentum in spherical coordinates

 P: 129 1. The problem statement, all variables and given/known data I want to derive the square of the total angular momentum as shown here: http://en.wikipedia.org/wiki/Angular...al_coordinates 2. Relevant equations The x,y, and z components of angular momentum are shown in the above link. I'm attempting to solve it by $$L^2=(L_x)^2 + (L_y)^2+(L_z)^2$$ 3. The attempt at a solution I think my problem is that I do not know how to deal with those partial differential operators. How do you go about squaring that binomial term that has differential operators? I think that's what I need to know and I don't know what to google to look for it. Thank you. 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution
 Sci Advisor HW Helper P: 11,947 You just need the chain rule of partial differentiation and a use of spherical coordinates...No binomial formulae needed.

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