I put this into sagecell online and get a messed up plot. f(x) simplifies to 1.
f(x)=2/3(cos(x)^2 + cos(x-(2/3)pi)^2 + cos(x-(4/3)*pi)^2)
(plot( f , -4,4))
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I put this into sagecell online and get a messed up plot. f(x) simplifies to 1.
f(x)=2/3(cos(x)^2 + cos(x-(2/3)pi)^2 + cos(x-(4/3)*pi)^2)
(plot( f , -4,4))
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