112. The sum of the solutions of the equation $\tan(3x)\tan(x) = 1$ in the interval $[\pi, 2\pi]$ is: $$5\pi \quad (1) \qquad 6\pi \quad (2) \qquad \frac{9\pi}{2} \quad (3) \qquad \frac{11\pi}{2} \quad (4)$$
\textbf{112.} The sum of the solutions of the equation $\tan(3x)\tan(x) = 1$ in the interval $[\pi, 2\pi]$ is:
$$5\pi \quad (1) \qquad 6\pi \quad (2) \qquad \frac{9\pi}{2} \quad (3) \qquad \frac{11\pi}{2} \quad (4)$$