In this free video tutorial, you will learn how to find the derivatives of a variety of trigonometric functions. Learn how to calculate the derivative of the most common trigonometric functions like tangent, sine, and cosine. To arrive at the derivatives of cos, sin and tan, you will be walked through the derivation of these formulas given the definition of the derivative. The derivative of sin(x) = cos(x), the derivative of cos(x) is -sin(x).