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By using Bianchi I type of homogenous and anisotropic background metric having cylindrical symmetry in $x$ direction of a local cartesian coordinates system, we solve metric field equations for a non-minimally coupled Einstein-Maxwell gravity. To do so we choose long wavelength EM waves where spatial dependence of the waves are negligible at the expansion duration. Motivation of this work is study directional effects of the EM vector potential on anisotropy trajectory of the space time expansion scale factor. This problem is checked just for de Sitter inflationary epoch because of its importance in the expansion of the universe. By applying the dynamical system approach we investigate stability nature of the cosmic system in two different cases: (a) direction of the EM vector potential is parallel to $x$ direction of the spacetime and (b) it is perpendicular to $x$ direction. We obtained at stable critical points for some of obtained inflationary solutions the EM waves behave as dark energy in cases $a$ and $b$ where the anisotropy is negligible by expanding of the universe while there are some stable critical points with inflationary stable solutions in case $b$ for which the EM waves behave as baryonic visible matter with non-vanishing anisotropy.