# Book Recommendation for Lagrangian and Hamiltonian Mechanics [duplicate]

I'm looking for a book recommendation for an undergraduate level textbook covering Lagrangian and Hamiltonian Mechanics. I'll be taking the second course on classical mechanics in the upcoming term. Ideally, I'd like a textbook that -- in addition to focusing on the application of the principles to solve physical systems, as mostly done in "$\text{PHY}: 101$" -- focuses on the theoretical aspects as well -- Poisson Brackets etc. Most of the textbooks I have seen seem to focus only on the former.

Since ideas in Hamiltonian and Lagrangian Mechanics pop up everywhere -- from non relativitic QM to QFT -- I'd appreciate if someone can recommend an undergraudate level textbook that caters to both of the aforementioned criteria.

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