Answered
need to know why after re opening the saved file the argument (t) of the sine and cos functions in v(t) keep disappearing and graph of a(t) failed to appear. Any help or suggestion is much appreciated . Thanks
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argument if sin...
The same question 
I've addressed this to the developers.
Despite redefining functions correctly, the issue shows up, even using the variable x instead of t and recreating the same construction.
@mike Please see also https://help.geogebra.org/t...
It's when saving and reopening that the bug pops up.
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