1. The problem statement, all variables and given/known data Find the integral of (Sin^4(x)*Cos^4(x)) in respect to x without using a calculator. 2. Relevant equations Sin^2(x) + Cos^2(x) = 1 Sin^2(x) = (1-Sin(2X))/2 Cos^2(x) = (1+Sin(2X))/2 Sin(2x) = 2Sin(x)Cos(x) Cos(2x) = Cos^2(x) - Sin^2(x) 3. The attempt at a solution I've been attempting to manipulate the equation so-as-to isolate a chain rule factor so I can use the U subsitution method on the problem. Unfortunately, my efforts so far have been fruitless.