How to solve this problem show me steps plz I am getting con

How to solve this problem? show me steps plz? I am getting confused about the rotation on 3d plane:( [ Find the 3 x 3 matrix that represents rotation ccw by 30 degree around the y axis followed by projection onto the xy plane. ]

Solution

A basic rotation (also called elemental rotation) is a rotation about one of the axes of a Coordinate system. The following three basic rotation matrices rotate vectors by an angle ? about the x, y, or z axis, in three dimensions, using the right hand rule