1. The problem statement, all variables and given/known data y = cos^3(5x^2-6) 2. Relevant equations 3. The attempt at a solution I used the chain rule for this question but im not sure about the cos^3 part. Using the chain rule i got -10xSin^3(5x^2-6) But was I supposed to use the power rule on the cos^3 part? I can think of 3 ways this could be done but im not sure which way to go about it. Thanks!