Let W (s, t) = F(u(s, t), v(s, t)) where W,(1,0) = = Wt(1,0) = u(1,0) = 5, u, (1, 0) = 5, ut(1, 0) = -5 v(1,0) = −7, v,(1,0) = −8, v₁ (1,0) = 8 F₂(5, −7) = 1, F₂(5, −7) = 9

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