Answered
Hello!
This is not so important but I noticed that the official manual says that the command:
Simplify [-2 sin (x) cos (x)] gives you a function f (x) = sin (-2 x)
But that's not true, because Geogebra does not simplify the expression in this case. GeoGebra provides exactly what you entered! (version 3.1.260)
With regards
Sime Suljic
The same problem 
not here:
typing in german
Vereinfache[-2sin(x)cos(x)] (engl. simplify)
gives exactly
f(x)=sin(-2x)
tested on GeoGebra 3.1.262
best regards
Olaf
yes, now in the most recent version is correct.
Sometimes a little strange, but true. For example:
Simplify[(cos(x))²-(sin(x))²] -> cos(-2x)
Simplify[2sin(x)cos(x)] -> -sin(-2x)
Bests, sime
ok, i see what you mean.
So, have to teach the symmetry of those functions, so that
that the childs have to simplify again :laughing:
Right, that's not what i want.
Let's wait, if the next release gives an answer.
best regards
Olaf
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