Recent content by swarog46

of course i mean that=) Whatever in the result for n=1 i get \int=0. and for \int^{2\pi}_0{cos(x)cos(1*x)dx}=\int^{2\pi}_0{cos^{2}(x)}=\pi

Homework Statement \int^{2\pi}_0{cos(x)cos(nx)dx}=?,n\in Z Homework Equations The Attempt at a Solution I think that this eq has zero solve. However my teacher says that its incorrect. cos(x) cos(nx) = 1/2 (cos (x-nx) + cos (x+nx))...