If $z ( x , y ) = f \left( x ^ { 2 } - y ^ { 2 } \right)$

question 85

Essay

If $z ( x , y ) = f \left( x ^ { 2 } - y ^ { 2 } \right)$ , then simplify $y \frac { \partial z } { \partial x } + x \frac { \partial z } { \partial y }$ .

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