[p, x^3] = [p, x*x^2] = [p, x]*x^2 + x*[p, x^2]
Using the commutation relation [p, x] = iħ, we have:
[p, x^3] = iħ*x^2 + x*[p, x^2]
Now, let's calculate [p, x^2]. Using the commutation relation [p, x] = iħ, we have:
[p, x^2] = [p, x*x] = [p, x]*x + x*[p, x] =
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