Verify that the first four terms of the Fourier series for the full wave rectification of the sine function
$f(t)=\sin (2 \pi f t){f=1 \text { below are: }} f(t)=\frac{2}{\pi}\left[1-2\left(\frac{1}{3} \cos 2 \pi t+\frac{1}{15} \cos 4 \pi t+\frac{1}{35} \cos 6 \pi t\right)\right]$

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The Answer of Verify that the first four terms of the Fourier series for the full wave rectification of the sine function
$f(t)=\sin (2 \pi f t){f=1 \text { below are: }} f(t)=\frac{2}{\pi}\left[1-2\left(\frac{1}{3} \cos 2 \pi t+\frac{1}{15} \cos 4 \pi t+\frac{1}{35} \cos 6 \pi t\right)\right]$

Verify That the First Four Terms of the Fourier Series