Not a Problem
Every other period, the line of the previous period connects to the line of the proceeding period. Not sure what's causing this. The .ggb is attached.
Files:
trig function g...
The same problem 
Every other period, the line of the previous period connects to the line of the proceeding period. Not sure what's causing this. The .ggb is attached.
I wrote a comment on this already in
https://www.geogebra.org/he...
It seems to be happen when the view is centered at 0; changing range from (-2n,2n) to (-2n,2n+0.1) helped for me.
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