This is vector calculus

Let f(u, v) = (u - v, 1, u + v) and g(x, y, z) = xyz. Find the entry @12(i.e. the entry in the first row and second column) of the derivative matrices Df(u, v), Dg(x, y) and D(g . f)(0, 1). (a) a12 of Df(u, v) is (b) a12 of Dg(x, y, z) is (c) a12 of D(g . f)(0, 1) is (d) Select the correct answer about D(g . f)(u, v)