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.The Fourier series for f(x)= cos^2 x expressed in (- \pi, \pi) is ...

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.The Fourier series for f(x)= cos^2 x expressed in $(- \pi, \pi)$ (- \pi, \pi) is

$\frac{1-cos 2x}{2 }$ \frac{1-cos 2x}{2 }

$\frac{1+cos x}{2 }$ \frac{1+cos x}{2 }

$\frac{1+cos 2x}{2 }$ \frac{1+cos 2x}{2 }

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