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## Re: [Axiom-developer] axiom for trigonometric functions again...

**From**: |
Waldek Hebisch |

**Subject**: |
Re: [Axiom-developer] axiom for trigonometric functions again... |

**Date**: |
Tue, 7 Nov 2006 14:01:51 +0100 (CET) |

Francois Maltey wrote:
>* In fact I try today to get a nice result for this exercice I'll give to my*
>* students : *
>* *
>* sum ((cos x)^k * cos (k*x), k=0..n) *
>* *
>* Is it possible to load at the boot-time the packages or the *
>* functions that we prefer ?*
>* *
>* So I won't need to type expand$MyExpand (cos (3*x/2)) but only expand*
>* (cos (3*x/2)) in the interpreter, even if my expand function in*
>* MyExpand.spad package will use sometimes the expand function of the*
>* manip.spad file.*
>* *
AFAICS you want to make your function visible and hide the system one
-- you can do this using )set expose system command.
At startup Axiom reads you initialization file, so probably you can
do this from initialization file (but I did not try).
BTW. Did you look at rischNormalize function in
ElementaryFunctionStructurePackage? In principle rischNormalize
should be able to do all possible trigonometric (and logarithmic)
simplifications.
--
Waldek Hebisch
address@hidden