Let W (s, t) = F(u(s, t), v(s, t)) where W,(1,0) WŁ(1,0) = u(1,0) = -1, u,(1, 0) = −5, ut(1,0) = -7 v(1,0) = -5, v,(1,0) = −7, vt(1,0) = -6 Fu(-1,-5) = −7, F₂(-1,-5) = 5

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