1.

___________ is a compatibility equation.

A. ( frac{ ^2 _y}{ y^2} + frac{ ^2 _y}{ x^2} = frac{ ^2 _{xy}}{ x y} )
B. ( frac{ ^2 _x}{ y^2} + frac{ ^2 _y}{ x^2} = frac{ ^2 _{xy}}{ x y} )
C. ( frac{ ^2 _x}{ y^2} + frac{ ^2 _y}{ x^2} = frac{ ^2 _{xy}}{ x y} )
D. ( frac{ ^2 _x}{ y^2} + frac{ ^2 _y}{ x^2} = frac{ ^2 _{xy}}{ x y} )
Answer» C. ( frac{ ^2 _x}{ y^2} + frac{ ^2 _y}{ x^2} = frac{ ^2 _{xy}}{ x y} )


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