= \frac{5}
{2}e^4 \left. {e^{\cos ^2 \varphi } } \right|_0^\pi - \left. {\cos 2\varphi } \right|_0^\pi = \frac{5}
{2}e^4 \left( {e - e} \right) - \left( {1 - 1} \right) = 0