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