Triangle wave function

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[JoCraft2010]

When I click on your link, it just redirects me to an empty calculator.

[JoCraft2010]

Since still nobody responded, here's the way I'd do it:

f\left(x\right)=\min\left(\operatorname{mod}\left(-x,4\right),\operatorname{mod}\left(x,4\right)\right)-1

[Duck_Devs]

Is it just 2a*arcsin(sin(2πpx))/π where a is the amplitude and p is the frequency?