Attached are two files, each of which contains a vector-based Sine Wave, Parabola and Hyperbola. This allows for fast, easy creation of these three curves, which can then be scaled and/or edited as desired. Nothing fancy.
One is an Asset file (Curves.afassets) and the other is the Affinity Designer v2.4.1 file from which the assets were originally generated (Curves.afdesign). The strokes are black, and I included a white rectangle in the background so they are clearly visible in the Assets Panel.
To install Assets, open the Assets Panel and choose Import Assets from the hamburger menu.
Lou Dina
Curves.afassets
Curves.afdesign