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Let $z = x ^ { 2 } + x y + y ^ { 2 }$

Question 135

Short Answer

Let $z = x ^ { 2 } + x y + y ^ { 2 }$ , $x = 2 u + v$ , and $y = u - 3 v$ . Show that $\frac { \delta ^ { 2 } z } { \delta u \delta v } = - 7$

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