If $I_n = \int_0^{\pi/4} \tan^n \theta d\theta$, then $I_{12} + I_{10}$ is equal to}
Show Hint
For integrals of the form $\int_0^{\pi/4} \tan^n x dx$, a useful recurrence relation is $I_n + I_{n-2} = \frac{1}{n-1}$. This property can quickly solve such problems by direct substitution of $n$.