Question

.The nature of partial differential equation (∂^2 u)/(∂x^2 )+4 (∂^2 u)/∂x∂y+(∂^2 u)/(∂y^2 )=0 is ________. *

Elliptic

Hyperbolic

Parabolic

none of the above​

Answer 1

Answer:

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Explanation:

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