\[\begin{array}{l}
 T4. \to \int {{e^x}} dx = {e^x} + C \\ 
 {\rm{Dokaz}}\,{\rm{(Proof):}} \\ 
 \int {{e^x}} dx = \left| \begin{array}{l}
 {e^x} = t \\ 
 {e^x}dx = dt \\ 
 \end{array} \right| = \int {dt}  = t = {e^x} \\ 
 \end{array}\]