Answered
Hi all!
Display mathematical equations is not correct in A. Correct is (-1) ^ 2, not -1 ^ 2 Graphs are correct.
GeoGebra 3.9.375.0 (23 September 2011) Java 1.6.0_26)
All the best!
Šime Š.
Files:
bug2011924.png
The same problem 
Thanks, fixed in 3.9.377.0 (without Google Translate this time :) )
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