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Rotational motion: (a) Show that [?̂?,?̂?]=?ℏ?̂?, [?̂?,?̂?]=?ℏ?̂?, [?̂?,?̂?]=?ℏ?̂?. (b) Show that [?̂2,?̂?]=0, and then, without further...

Rotational motion:
(a) Show that [?̂?,?̂?]=?ℏ?̂?, [?̂?,?̂?]=?ℏ?̂?, [?̂?,?̂?]=?ℏ?̂?.
(b) Show that [?̂2,?̂?]=0, and then, without further calculations, justify the remark that [?̂2,?̂?]=0 for all ?=?,?,and ?. What does this mean in terms of uncertainty principles?

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