Those 3 mats Rx Ry Rz are just 3 separate examples from Wikipedia of how to construct a rotation matrix where the rotation axis is in the x, y, or z direction.

Those 3 mats Rx Ry Rz are just 3 separate examples from Wikipedia of how to construct a rotation matrix where the rotation axis is in the x, y, or z direction. They are separate rotations that don’t have to be combined.