begin{thm}label{thm:1}
If $fin C^0([a,b])$, then one has
begin{equation}
label{eq:1}
int_a^b f'(x)dx=f(b)-f(a),
end{equation}
holds in distribution sense.
end{thm}
The theorem ref{thm:1} is called fundamental theorem in calculus, and eqref{eq:1} is called Newton-Libniz formula.

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