,\varepsilon \right) &=&\frac{0}{\Gamma (0-\alpha _{0})}\varepsilon \int_{0}^{t}{\frac{u^{\prime }(s)}{{(t-s)}^{\alpha _{0}}}ds-\varepsilon \int_{0}^{t}{\left( \left( t-s\right) k\left( s\right) +u\left( s\right) k\left( s\right) \right) ds}-0+\frac{0}{0}{\left( k^{\prime }\left( t\right) \right) }^{0}