Solve this:

Question No. 1


$$\begin{gathered} \mathrm{If} \tan 35°\mathrm{a}, \mathrm{then} \mathrm{the} \mathrm{expression} \\ \frac{\left(\tan {215}^{\mathrm{o}}+\tan {125}^{\mathrm{o}}\right)}{\left(\tan {235}^{\mathrm{o}}-\tan {325}^{\mathrm{o}}\right)}, \mathrm{when} \mathrm{writen} \mathrm{in} \mathrm{terms} \mathrm{of} \mathrm{a}, \mathrm{is} \\ \left(\mathrm{A}\right) \left({\mathrm{a}}^2+1\right)/\left({\mathrm{a}}^2-1\right) \\ \left(\mathrm{B}\right) \left(1+{\mathrm{a}}^2\right)/\left(1-{\mathrm{a}}^2\right) \\ \left(\mathrm{C}\right) \left({\mathrm{a}}^2-1\right)/\left({\mathrm{a}}^2+1\right) \\ \left(\mathrm{B}\right) \left(1-{\mathrm{a}}^2\right)/\left(1+{\mathrm{a}}^2\right) \end{gathered}$$