3 b] If u=e^{ax+by}f(ax-by)b\frac{\partial u}{\partial x}+a\frac{\partial u}{\partial y}=2abu prove that concept of composite functions.
Prove that by using the concept of composite functions
3 b] If u=e^{ax+by}f(ax-by)b\frac{\partial u}{\partial x}+a\frac{\partial u}{\partial y}=2abu prove that concept of composite functions.