The number of distinct real roots of \(\left|\begin{array}{ccc}\sin \rm x & \cos \rm x & \cos \rm x \\ \cos \rm x & \sin \rm x & \cos \rm x \\ \cos \rm x & \cos \rm x & \sin \rm x\end{array}\right|\) = 0 in the interval −\(\frac{\pi}{4}\) ≤ x ≤ \(\frac{\pi}{4}\) is