You need to remember the Leibniz rule for a differentiable function `f(v,x)` such that:

`d/(dx) int_(a(x))^(b(x)) f(v,x) dv = int_(a(x))^(b(x)) (del f(v,x))/(del x) dv`

In this case, the limits `a(x)` and `b(x)` are constants, but if `a(x)` and `b(x)` are not constants, hence, the extended Leibniz rule is the following,...

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You need to remember the Leibniz rule for a differentiable function `f(v,x)` such that:

`d/(dx) int_(a(x))^(b(x)) f(v,x) dv = int_(a(x))^(b(x)) (del f(v,x))/(del x) dv`

In this case, the limits `a(x)` and `b(x)` are constants, but if `a(x)` and `b(x)` are not constants, hence, the extended Leibniz rule is the following, such that:

`d/(dx) int_(a(x))^(b(x)) f(v,x) dv = int_(a(x))^(b(x)) (del f(v,x))/(del x) dv + b'(x)(f(b(x),x)) - a'(x)(f(a(x),x))`

**Hence, you may use either the extended form, or the simpler form of Leibniz rule, depending on the nature of limits `a(x)` and `b(x).` **