Sånn går det – en halvsirkelgraf

Det tok sin tid – men her er den:
f(x)=\frac{sin(\frac{\pi x}{2a})\sqrt{\big|\big(a - \left(x - \lfloor \frac{x}{2a}\rfloor (2a)\right)\big)^2 - a^2\big|}}{|sin(\frac{\pi x}{2a})|}

Yay, nerdout:)

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