A solution of the partial differential eq. (∂^2 u)/(∂x^2 )=9 (∂^2 u)/(∂y^2 ) is.

A. COS(3X-Y)
B. X2+Y2
C. E-3PIEXSIN(PIE Y)
D. NONE
View Answer

C. E-3PIEXSIN(PIE Y)

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