The 2nd Derivative Test

Is the curve concave up? Or concave down? The first derivative doesn't tell us whether the horizontal slope is a maximum or a minimum. The second derivative is one way to tell. Calculus Made Easy, Chapter XII, Curvature of Curves. Download the full text for free: https://bit.ly/EasyCalculus ... https://www.youtube.com/watch?v=H97rmEBlEXo