S 12 TI + 12 + 3.13 = 0 (a) Use the Subspace Test to prove that S is a subspace of R.. (b) Find a basis for S. (c) Describe the subset S of Re geometrically.Consider 2, n E R with n * 0. The mirror image of a over a plane with normal vector n is given by refl, = = = -2proj , E. Show that refl , i C Span {proj , 2, perp , 2}