Three Dimensional Geometry

If the lines, \(\frac{x-3}{2}=\frac{y-2}{3}=\frac{z-1}{\lambda}\) and \(\frac{x-2}{3}=\frac{y-3}{2}=\frac{z-2}{3}\) are coplanar, then \(\sin ^{-1}(\sin \lambda)+\cos ^{-1}(\cos \lambda)\) is equal to