Basically, I am trying to generate a half sine wave using excel. The waveform that I am looking for is a wave which has a positive component from $0$ to $\pi$ and a zero component from $\pi$ to $2\pi$. Image attached for reference (red graph). I'm looking for the equation of said graph. Graph of half-rectified sine wave
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$\begingroup$How about$$ f(x) = \frac{1}{2}\left(\sin(x) + \left| \sin{x} \right| \right) $$
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