Let $\overline{\mathrm{a}}$ and $\overline{\mathrm{b}}$ be two non-zero vectors perpendicular to each other and $|\overline{\mathrm{a}}|=|\overline{\mathrm{b}}|$. If $|\overline{\mathrm{a}} \times \overline{\mathrm{b}}|=|\overline{\mathrm{a}}|$, then the angle between the vectors $(\overline{\mathrm{a}}+\overline{\mathrm{b}}+(\overline{\mathrm{a}} \times \overline{\mathrm{b}}))$ and $\overline{\mathrm{a}}$ is equal to: