Let \(u\) denotes the solution of the initial value problem:
\(u^\prime +cu = d(t) , \ u(0)=0\) ,
where \(c\) is a complex constant. Let \(d\) be a continuous function and bounded by \(M\) on
\([0,\infty)\). Then, prove that
\(\mid u(t) \mid \le \frac{M}{\mid Re(c) \mid }, \ for \ all \ t \in [0,\infty).\)
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