Not a Problem
The circle with the x icon in the last tab on the iphone graphing app doesn't work with parentheses defined points or Point(..., ...). It does work with lists “{}”.
It seems to be replacing the icon as the function VECTORPRODUCT which doesn’t seem to be defined anywhere. I think the correct replacement should be CROSS.
The same problem 
Graphing calculator has some things disabled, please try https://www.geogebra.org/calculator
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