Derivative of sin x and cos x | Derivatives (12 videos) | Highlights of Calculus | MIT OpenCourseWar
The two key functions of oscillation have specially neat derivatives: The slope of sin x is cos x ! And the slope of cos x is - sin x. These come from one crucial fact: (sin x) / x approaches 1 at x = 0. This checks that the slope of sin x is cos 0 = 1 at...