Derivative of tan(x) - Wyzant Lessons
www.wyzant.com › calculus › derivative_proofsDerivative proof of tan(x) We can prove this derivative by using the derivatives of sin and cos, as well as quotient rule. Write tangent in terms of sine and cosine. Take the derivative of both sides. Use Quotient Rule. Simplify. Use the Pythagorean identity for sine and cosine. and simplify. Derivative proofs of csc(x), sec(x), and cot(x) The ...