(e) [p, f(f)] (f) [â, Ħ] for general potential V (x)
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[?,?(?)]?=(??(?)−?(?)?)?
knowing that ?=−?ℏ∂∂? you'll get
[?,?(?)]?=−?ℏ∂∂?(?(?)?)+?ℏ?(?)∂∂??=−?ℏ?∂∂??(?)−?ℏ?(?)∂∂??+?ℏ?(?)∂∂??
from where you find that [?,?(?)]=−?ℏ∂∂??(?)
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