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Ejercicios resueltos de Cálculo - Universidad de Málaga

Ejercicios resueltos de Cálculo - Universidad de Málaga

Ejercicios resueltos de Cálculo - Universidad de Málaga

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Optimización no-lineal 277<br />

Problema 145 Hallar zxx si z = f(u,v), u = x 2 − y 2 y v = 2xy. Expresar la respuesta en términos <strong>de</strong> u, v y<br />

las <strong>de</strong>rivadas parciales <strong>de</strong> f.<br />

∂z ∂u ∂v<br />

= D1f + D2f<br />

∂x ∂x ∂x = D1f(u,v) · (2x) + D2f(u,v)(2y) = 2xD1f(u,v) + 2yD2f(u,v)<br />

zxx = ∂2 z<br />

∂x 2 = 2D1f + 2x(D11f · (2x) + D21f · (2y)) + 2y (D12f · (2x) + D22f · (2y))<br />

= 2D1f + 4x 2 D11f + 8xyD21f + 4y 2 D22f<br />

Obsérvese que en la simplificación hemos usado la igualdad D21f = D12f que se <strong>de</strong>duce <strong>de</strong>l teorema <strong>de</strong> Schward.<br />

<strong>Ejercicios</strong> <strong>resueltos</strong> <strong>de</strong> <strong>Cálculo</strong>. c○Agustín Valver<strong>de</strong>

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