The PDE ∂2u/∂x2+∂2u/∂y2 = f(x,y) is called as
The first differentiation of a constant is equal to.
Differential equation for y = A cos ∝ x + B sin ∝x, where A & B are arbitary constants, is
Integrating factor of differential equation cos x dy/dx + y sin x = 1 is
If p & q are roots of x2+px+q=0 then
For a differential function f(x) to have maximum, df/dx & d2f/dx2 should be