Problems based on Formation of p.d.e by
elimination of arbitrary functions
b) Case (ii) a.f 2, p.d.e order = 2
Example
1.2(b) (1): Form the p.d.e. by eliminating the arbitrary functions f andϕfrom z
= f (x + ct) + ϕ (x − ct).
Example
1.2(b) (2): Form the p.d.e. by eliminating f and ϕ from z
= f (y) + ϕ (x + y + z).
Example
1.2(b) (3): Eliminate the arbitrary functions f and g from z= f(x+ iy) +
g(x-iy) to obtain a partial differential equation involving z, x, y.
Example
1.2(b)(4): Form the p.d.e. by eliminating f and ϕ from
Example
1.2(b) (5): Form the differential equation by eliminating the arbitrary
functions ƒ and g in z = f (x3 +2y) + g(x3 − 2y)
Example
1.2(b)(6) : Form the partial differential equation by eliminating the arbitrary
functions f and g in z = x2f(y) + y2 g(x).
Example
1.2(b) (7): Obtain the partial differential equation by eliminating f and g
from z = f(2x + y) + g (3x - y).
Example
1.2(b) (8): Form a partial differential equation by eliminating arbitrary
functions from z = = xf (2x + y) + g (2x + y).
Solution
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