Let D be a 4 × 4 matrix of the following form: [a11 a12 b11 b12 a21 a22 b21 b22 D = 0 0 C11 C12 0 0 C21 C22 That is D is "built up" of the four 2×2 matrices consisting of the together with a 2 × 2 matrix of 0's. aij bij and Cij coefficients, Show that: det (D) = det (La a11 a12 C12 a21 a22 C21 C22