1. The problem statement, all variables and given/known data Evaluate the integral x^(-1/5) tan(x^(4/5)) dx 2. Relevant equations 3. The attempt at a solution Set u = x^(4/5) Therefore du = 4/5 x ^ (-1/5) dx which gave me 5/4 ∫ tan(u) du integral of tan is natural log of absolute value of sec(u) sub in x^(4/5) for u and get 5/4 natural log of absolute value of sec(x^(4/5)) + c I'm sorry if I didn't use the proper formatting as I'm not %100 how. I will attach an image to clarify my work. I used an indefinite integral calculator to check my work but it is giving a different answer. Can anyone verify that this solution is correct?