Calculus 5.4 Derivatives of Sine and Cosine Functions
Channel: Ms Havrot's Canadian University Math Prerequisites
Date: 2020-03-06

E F A !!!  The most important three letters that you need to remember when doing derivatives of trigonometric functions.  It stands for EXPONENT, FUNCTION,  ANGLE  This will make all of your trig derivatives a breeze!  Also it is cool to note that every trig function that starts with the letter C -- cosine, cosecant, cotangent ALL have derivatives that are negative.  You will be singing my praises for the EFA rule!