Command Symplify

simes shared this problem 13 years ago
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

Comments (3)

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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

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1

Vereinfache[-2sin(x)cos(x)] (engl. simplify) gives exactly

f(x)=sin(-2x)

tested on GeoGebra 3.1.262

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

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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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