Derivatives of Trigonometric Functions
www.ocf.berkeley.edu › ~reinholz › edDerivatives of Trigonometric Functions Before discussing derivatives of trigonmetric functions, we should establish a few important iden-tities. First of all, recall that the trigonometric functions are defined in terms of the unit circle. Namely, if we draw a ray at a given angle θ, the point at which the ray intersects the unit circle