W(s, t) = F(u(s, t), v(s, t)), where F, u, and v are differentiable. %3D If u(1, — 3) — 7, и, (1, — 3) v:(1, – 3) = - 7, F„(7, 6) — 2, и(1, — 3) – 3, and F(7,6) - 8, v(1, – 3) = 6, v,(1, – 3) = 3, - 6, then find the following: %3D %3D W.(1, – 3). %3D W:(1, – 3)

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