Answered: Please explain the math behind how this…

Please explain the math behind how this went from an expectation value of the commuter of the hamiltonian and the momentum, to just the commuter. (the problem defines Ptot = P1+P2)

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter6: The Trigonometric Functions

Section6.7: Applied Problems

Problem 23E

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Please explain the math behind how this went from an expectation value of the commuter of the hamiltonian and the momentum, to just the commuter. (the problem defines Ptot = P1+P2)