Consider, $z$ a function of $z= f(x,y)$ and D & D' respectively represent partial differential operators, i.e $$\frac{∂}{∂}, \quad\frac{∂}{∂y}$$
i am learning particular integrals for PDE using the expansion method but unable to understand the marked expansions used in the image. can someone help with this?
2026-03-26 13:57:15.1774533435
Particular Integral of a Homogenous Linear PDE
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