The two main Trigonometric Derivatives that you will need to know are: d(sinx)/dx=cosx d(cos)/dx=-sinx However there are several others (tanx, cotx, secx, cscx) that are also useful to memorize. Derivatives of Trigonometric Functions (cr: Organic Chemistry Tutor) You will see functions that look like: sin2x and may wonder how to derive/solve these. We will be … Continue reading 3.5 – Derivatives of Trig Functions