5. find the derivative matrices of the following composition of functions (a) f. g where f(x, y)= 2x -3y, g(u, v) = (usinu, usinu) (b)fg where f(x. y. 2) = (x2 + y + ,x-y+ 22), g()= (21, ,2r*) (c) f. g where f(x, y, z) = (xyz, xyxz - yz) where gu, u, w) = (uc, uu, vu)