On Mon, 16 May 2011, Luigi Marino wrote:
> Maxima have?many?problems
> with trigonometric functions,
> it is not able to reduce
> acos(cos(x)) to x
> If you try all?trig simplification
> acos(cos(x)) is never ?x
Because acos(cos(x)) is not x!
It is the following function
^
/\ /\ | /\ /\
/ \ / \ | / \ / \
/ \ / \ | / \ / \
/ \ / \ | / \ / \
/ \/ \|/ \/ \
------------------------------------------>
For example, acos(cos(x)) is an even function, because cos(x) is even.
Andrey