Dependent variables and all its derivatives must be in 1st degree for. A. LINEAR B. NON LINEAR C. WAVE EQ D. HEAT EQ View AnswerA. LINEAR Related MCQs Boundry conditions which include boundry valus is. Identify the langrange equation. 1st standard form of non-linear pde. Langrange method is used to find. ∂u/∂x=g is ____ B.C. Boundry value problem is taken as. U=F(x-ct)+G(x+ct) gives. Uxx+Uyy=0 is. Initial state is a part of auxiliary data . In PDE integration constants are.