1. The problem statement, all variables and given/known data Hell My problem is as follows: Determine the following commutators: [px2,x],[pxx2],[px2,x2],. The calculation can be done in two ways, either by inserting a test function, and using the explicit expressions for the operators, or by utilizing Jacobi identity and using the fact that [x,px]=ihbarred . You should master both methods. 2. Relevant equations [A,B]=AB-BA [x,px]=ihbarred [A,BC]=B[A,C]+[A,B]C px=-ihbarred*d/dx p2=-hbarred2*d2/dx2 3. The attempt at a solution Here's the problem- I just cannot find good paper with proper explanation how to do it and examples with solutions. I am also not familiar with term and meaning of jacobian- in the textbook I am using there is no explanation of jacobian, or how to solve commutators, not even mentioning solving commutators with jacobians.