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Homework Statement
Let [tex]u(t)=2-\cos(t)+\sin(2t)- \cos(3t)+ \sin(4t)[/tex]
Evaluate:
[tex]\int_0^{2\pi}u^2(t)\mbox{d}t[/tex]
Homework Equations
The Attempt at a Solution
Sorry, I don't have any idea :(... As I can see
[tex]\int_0^{2\pi}u^2(t)\mbox{d}t[/tex]
is similar to the first term of Fourier Serie of the function u^2(t)...