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Describe the regions where the PDE is hyperbolic (h); parabolic (p) and elliptic (e):

 Describe the regions where the PDE is hyperbolic (h); parabolic (p) and elliptic (e):

(a) uxx - uxy - 2uyy = 0

(b) 2uxx + 4uxy + 3uyy + 7u = 0

(c) yuxx 2uxy + e xuyy =3

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