linear approximation

Linear approximation is a method used to estimate the value of a function near a specific point by using a straight-line (linear) function. Essentially, it involves drawing a tangent line at that point, which closely resembles the curve of the original function nearby. This tangent line acts as a simple, accurate shortcut to predict the function's value without calculating complex equations. It's especially useful when you need a quick estimate of the function’s behavior close to the point you're interested in.