1. The problem statement, all variables and given/known data The first derivative of the function f is given by f '(x)= (((cos^2)x)/(x)) - 1/5 How many critical numbers does f have on the open interval (0,10)? 2. Relevant equations 3. The attempt at a solution I already got this question wrong but I don't know why I got it wrong. The answer is 3 but when I graph it I see 6 critical numbers. So why is it 3 and not 6? Please explain.