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If f is a continuous function on [a, b] ...

If f is a continuous function on `[a, b]` and `u(x)` and `v(x)` are differentiable functions of x whose values lie in `[a, b]` then `d/dx { int_(u(x)) ^(v(x)) f(t) dt} = f(v(x)) d(v(x))/dx - f(u(x)) d(u(x))/dx`

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