The Practically Cheating Calculus Handbook - S Deviant  ## Metadata - Author: **S Deviant** - Full Title: The Practically Cheating Calculus Handbook - Category: #books - Tags: #mathematic ## Highlights - A differential equation is an equation that involves an unknown function and its derivative. For example, the equation f’(x) + f(x) = x + 3 is a differential equation, with f(x) as the unknown function. (Location 1001) - Ordinary differential equations are equations have a function as the solution rather than a number. In addition, differential equations contain information about the function’s derivatives. When solving differential equations, you may be required to solve an equation with an initial condition. For example, the differential equation ds⁄dt=cos(x) is an ordinary differential equation, butds⁄dt=cos(x);y(π) = 0 is an ordinary differential equation with an initial condition, (Location 1017)