You may have made a mistake while simplifying or you may have calculated the incorrect ratio. This value is equal to $\displaystyle{{\tan{{45}}}}^{\circ}\usepackage{cmbright}\Huge\$ or $\displaystyle{{\cot{{45}}}}^{\circ}\usepackage{cmbright}\Huge\$ . To calculate secant, use: $\displaystyle{\sec{\theta}}=\frac{{1}}{{\cos{\theta}}}=\frac{{1}}{{x}}\usepackage{cmbright}\Huge\$