User:Vossman/Affine

${\begin{bmatrix}s&0\\0&s\\\end{bmatrix}}{\begin{bmatrix}1&0\\0&\cos {\theta }\\\end{bmatrix}}{\begin{bmatrix}\cos {\phi }&\sin {\phi }\\\sin {\phi }&\cos {\phi }\\\end{bmatrix}}={\begin{bmatrix}s\cos {\phi }&s\sin {\phi }\\s\cos {\theta }\sin {\phi }&s\cos {\theta }\cos {\phi }\\\end{bmatrix}}$