19 A level Mathematics Calculus Differentiating Trig Functions from First Principles Part 2 Video 7

This video, part 2 of our A-level mathematics calculus series, focuses on differentiating trigonometric functions from first principles. We specifically derive the derivative of cos x using the definition of the derivative. The method involves applying the compound angle formula for cos(x+h) and then utilizing small angle approximations for sin h and cos h as h approaches zero. By simplifying the expression, we demonstrate how the derivative of cos x is found to be -sin x directly from first principles. Subscribe to @AxiomTutoringCourses for more A-level calculus tutorials!