1. The problem statement, all variables and given/known data Find the derivative of g(x)=R(sqrt(u(x)). Both R and u are differentiable functions. 2. Relevant equations N/A 3. The attempt at a solution I have been told that the solution is R' (sqrt(u(x)) * (1/2)u^(-1/2) * u' but I have no idea why. Please explain how to get to this solution. Thanks.