W(s, t) = F(u(s, t), v(s, t)), where F, u, and v are differentiable. If u(3, 6) = -7, us (3,- 6) = 9, ut (3, 6) = 3, v(3, — 6) = 7, vs(3, — 6) = — 2, vt (3,6)= 5, Fu(-7, 7) -4, and F(-7, 7) = -3, then find the following: W,(3, 6) Wt(3, 6) =

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