Question
a.
\(\frac{∂^2 h}{∂x^2}+\frac{∂^2 h}{∂y^2}=0\)
b.
\(k_x \frac{∂^2 h}{∂x^2}+\frac{∂^2 h}{∂y^2}=0\)
c.
\(\frac{∂^2 h}{∂x^2}+k_y\frac{∂^2 h}{∂y^2}=0\)
d.
\(\frac{k_x}{k_y}\frac{∂^2 h}{∂x^2}+\frac{∂^2 h}{∂y^2}=0\)
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