Equation
x y p x y q z z
2
cos( ) sin( )
is a quasi-linear equation
Quasi-linear partial differential equations of first order can be written as
where are functions of and . They do not involve or . Here, linear means that and appear to the first degree only.
In our case, the equation
is a quasi-linear equation.
It's linear with respect to the derivatives (p and q)
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