\left\{ \begin{array} { l } { \frac { d c ( t ) } { d t } = + c ( t ) } \\ { c ( 0 ) = 0 } \end{array} \right.
Solve for c, t
t\neq 1\text{, }c=0
t=1\text{, }c\in \mathrm{R}
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