Toxy Tronic
I like it's simplicity but there is a minor glitch: When tapping on the graph of a function a crosshair appears that can be moved along the graph to get the current x,y-values.But it happens quite often that the crosshair is not moving over the graph but somewhere else.To rectify this the graph needs to be "refreshed".This happens on 3 different smartphones:(very old,old and almost new). It can happen,when the values for the x-axis are changed or the smartphone goes into sleep mode.
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