Back for a couple more I'm having a little trouble with. The first is sech(1/x)tanh(1/x) all over x^2 Here I'm not sure how to deal with integrating hyperbolics at all as we haven't gotten to it in class yet. I did some searching on the internet and found that the integral tanh(x)sech(x) = -sech(x) + C. With all of it being over x^2 it becomes a little more complicated. Do I rewrite x^2 as x^-2 and multiply it through with the 1/x's? Would the property tanh(x)sech(x) = -sech(x) + C still work? I was also wondering about rewriting the whole equation as (2/e^1/x + e^-1/x)(e^1/x - e^-1/x /e^1/x - e^-1/x)(1/x^2). That seems overly complicated though and I'm not sure what form to go to from that point. The other problem I'm having trouble with is integrating cos^-3(2θ)sin(2θ)dθ I know of ways of integrating sin and cos that have squares but is there a property I can use that's cubed and a double angel?