Explain Zwiebach Problem 12.9 Second Equalities

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SUMMARY

The discussion centers on the second equalities presented in Problem 12.9 of the Zwiebach textbook, specifically focusing on the equations with curly braces on the right-hand side. The participant is encouraged to attempt solving the equations independently, as they are deemed straightforward. If difficulties persist, sharing their attempts for further guidance is recommended.

PREREQUISITES
  • Understanding of the Zwiebach textbook, specifically Problem 12.9
  • Familiarity with mathematical notation and equations
  • Basic knowledge of physics concepts related to the problem
  • Ability to interpret and analyze mathematical expressions
NEXT STEPS
  • Review Problem 12.9 in the Zwiebach textbook for context
  • Practice solving similar equations involving curly braces
  • Explore additional resources on mathematical notation in physics
  • Engage in discussions or forums focused on the Zwiebach textbook for collaborative learning
USEFUL FOR

Students studying theoretical physics, particularly those working through the Zwiebach textbook, and anyone seeking to enhance their problem-solving skills in mathematical physics.

ehrenfest
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Homework Statement


Can someone explain the second equalities on the second (and third) lines of this attachment i.e. the two equalities in which there are curly braces on the RHS.


Homework Equations





The Attempt at a Solution

 

Attachments

  • Zwiebach 129.jpg
    Zwiebach 129.jpg
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Ehrenfest, these two equations are very straight-forward and you can do it yourself with no trouble. I suggest you try it again and in the unlikely event that you still don't get it, post your efforts so we can see where you are going wrong.
 

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