Let W(s, t) = F(u(s, t), v(s, t)), where F, u, and v are differentiable, and the following applies. u(0, 5) = −2 v(0, 5) = 3 us(0, 5) = −4 vs(0, 5) = 2 ut(0, 5) = 4 vt(0, 5) = −1 Fu(−2, 3) = −7 Fv(−2, 3) = −8 Find Ws(0, 5) and Wt(0, 5)