1.

Consider the following partial differential equation for with the constant c > 1:Solution of this equation is \(\frac{{\partial u}}{{\partial y}} + c\frac{{\partial u}}{{\partial x}} = 0\)

A. u(x,y) = f(x + cy)
B. u(x, y) = f(x – cy)
C. u(x, y) = f(cx + y)
D. u(x,y) = f(cx – y)
Answer» C. u(x, y) = f(cx + y)


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