Question
a.
\((\frac{∂^2}{∂x^2} +\frac{∂^2}{∂z^2})=0\)
b.
\((\frac{∂^2}{∂y^2} +\frac{∂^2}{∂z^2})(σ_y+σ_z )=0\)
c.
\((\frac{∂^2}{∂x^2} +\frac{∂^2}{∂y^2})(σ_x+σ_y )=0\)
d.
\((\frac{∂^2}{∂x^2} +\frac{∂^2}{∂z^2})(σ_x+σ_z )=0\)
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