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Work out the following PDEs and hence classify them as parabolic, hyperbolic or elliptic. a) 2U xx + 3U xy + U yy = 0

Work out the following PDEs and hence classify them as parabolic, hyperbolic or elliptic.

a) 2U_xx+ 3U_xy+ U_yy= 0

b) U_xx+ 4U_xy+ 4U_yy= 0

c) U_xx+ U_yy= 0

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