There is a general formula for the derivative of a function:
Where $\Gamma(x) $ is the Gamma function
I tried using the formula to evaluate the 3rd derivative of $\cos(x)$, but I get confused quickly. It would be very appreciated if someone could show a step by step solution to this problem.
I'm totally aware the answer is $\sin(x)$, but what's the process to get to that solution?