Law homework help. 1 SupposeExplain why this is a rotation matrix and find the angle of rotation.2 Let T be the linear map that reflects a vector v in R2 about the line y = mx.Use a change of basis argument to find the matrix representation A for T.3 Let .Show that Q is orthogonal with determinant ?1. Find the axis of rotation, the plane of reflection and the cosine of the angle of rotation.