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+# Exercice 1
+## 1.
+## 2.
+
+- 
+## 4.
+- $f$ est $C_{p.m.}$
+- $f(x) \geq 0 \Leftrightarrow k \geq 0$
+- $$
+\begin{align}
+	\int^{+\infty}_{-\infty}f(t)dt &= \int^{+\infty}_{-\infty}ke^{-kt}dt \\
+	&= \int^{0}_{-\infty}ke^{-kt}dt + \int^{+\infty}_{0}ke^{-kt}dt \\
+\end{align}
+$$
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