[TEX]I=\int{e^xcos2{\pi{x}}dx[/TEX]
[TEX]\left{u=e^x\\dv=cos2{\pi{x}dx\Rightarrow{\left{du=e^xdx\\v=\frac{1}{2\pi}sin2{\pi{x}[/TEX]
[TEX]I=\frac{1}{2\pi}e^xsin2{\pi{x}-\frac{1}{2\pi}\int{e^xsin2{\pi{x}dx[/TEX]
[TEX]I_1=\int{e^xsin2{\pi{x}dx[/TEX]
[TEX]\left{u=e^x\\dv=sin2{\pi{x}dx[/TEX][TEX]\Rightarrow{\left{du=e^xdx\\v=-\frac{1}{2\pi}cos2{\pi{x}[/TEX][TEX]\Rightarrow{I_1=-\frac{1}{2\pi}e^xcos2{\pi{x}+\frac{1}{2\pi}I[/TEX]