I'm not sure how to do this one. Only way I can think of is using the Product Rule but I don't know how to apply it when there are more than two functions. Something like: y=(x)(sinx)(cosx) --separate it into three different functions-- f(x)=x, g(x)=sinx, z(x)=cosx --use Product Rule-- ??? Are those the right steps to differentiate the function and if they are how do I apply the Product Rule to three functions instead of just two? Any help would be appreciated.