Which of the following is a general solution to the differential equation y'' + 4y = 0?

What is the integrating factor for the first-order linear differential equation dy/dx + P(x)y = Q(x)?

Consider the differential equation x^2*y'' - 2x*y' + 2y = 0. Which type of equation is this?

Which of the following methods is typically used to solve a system of linear differential equations with constant coefficients?

What is the order of the differential equation (d^3y/dx^3) + (dy/dx)^4 + y = x?

Which of the following is a particular solution to y'' - y = e^x?

Which equation is exact: (2xy + cos(x))dx + (x^2)dy = 0?

What is the Wronskian used for in differential equations?

What is the general solution to y' = y?

What is the Laplace transform of f(t) = t?