1. The problem statement, all variables and given/known data Find the area of the region between x=-pi/6 and x=pi/4 above the x-axis and below the graph of: y=cos(2x)(8-cos(2x)) 2. Relevant equations 3. The attempt at a solution I know I need to reformulate the expression somehow so that it is easier to integrate, and I'm guessing it's a double angle formula like: cos (2x) = 2 cos^2 x -1 but I can't seem to bring it all together to find something I know how to integrate. Any hints? This is an assignment question, so I'd like to know how to do it properly. I've also changed a few of the values (but not the argument of the trig functions).