Don't know how to solve problem for calculus homework!!! Pls help

Question

The displacement of a particle on a vibrating string is given by the equation s(t) = 13 + 1/2 sin(13𝜋t) where s is measured in centimeters and t in seconds. Find the velocity of the particle after t seconds.

Answer 1

Velocity is the derivative of displacement. Use the fact that the derivative of sin(x) is cos(x) and use the chain rule.