1. The problem statement, all variables and given/known data sin-13x+ln sqrt(x) sqrt(sec x) 2. Relevant equations 3. The attempt at a solution I have a very long solution, which is hard to type in. My final answer is: -3cos3x/sin23x + (1+xtanx)/2x I don't check it with a derivative calculator because usually it makes mistakes. I ask someone to solve the problem and see if this is the right answer. Thank you!