We have given the differential equation,
(2xz−yz)dx+(2yz−zx)dy−(x2−zx+y2)dz=0
This equation can be solved using the Pfaffian method,
Firstly we have to check whether the given differential equation is integrable or not.
Compare it with Pdx+Qdy+Rdz=0
We get,
P=(2xz−yz)
Q=(2yz−xz)
R=−(x2−zx+y2)
Now, P(δzδQ−δyδR)+Q(δxδR−δzδP)+R(δyδP−δxδQ)=0
After putting values we get P(δzδQ−δyδR)+Q(δxδR−δzδP)+R(δyδP−δxδQ)=0
Hence the given differential equation is integrable.
Now to find the solution of the differential equation consider 'z' as constant then dz=0
Hence, Pdx+Qdy=0
then,
(2xz−yz)dx+(2yz−xz)dy=0
which is a exact differential equation whose solution can be given as
x2z−xyz+y2z=C
which is of the form u(x,y,z)=C
Hence, u(x,y,z)=x2z−xyz+y2z
Now, we are introducing two variables μ and k
whose values can be calculates as
μ=P1δxδu
=(2xz−yz)12xz−yz
=1
and, k=μR−δzδu
k=x2−zx+y2−x2−xy+y2
k=−xy−zx
k=−x(y+z)
Solution of differential equation can be find out by solving the differential equation,
δzδu+k=C
x2−xy+y2−x(y+z)=C
This is the solution of the given differential equation.
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