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## Main Question or Discussion Point

Dear all, a question which has puzzled me for some days:

(Assume that all are differentiable enough times):

Calculate:

[tex]

\frac{\mathrm{d} }{\mathrm{d} x}\int_{g(x)}^{h(x)} f(x,t) dt

[/tex]

(Assume that all are differentiable enough times):

Calculate:

[tex]

\frac{\mathrm{d} }{\mathrm{d} x}\int_{g(x)}^{h(x)} f(x,t) dt

[/tex]