Hi Burcin and Karl-Dieter,
// 1 // And what do you think about log ? Look at these test :
exp(x).operator() == exp # is True, and all(?) trigonometric functions
are fine
log(x).operator() == ln # is True, yes the alias ln is better than the
log name
log(x).operator() == log # is False (this feature looks like the
binomial one)
log(x).operator() == sage.function.log.function_log # is True
// 2 //
Do you want I place somewhere the rewrite function I test and improve ?
Where ?
I code a syntax with strings "from2target", by example "tancot2sincos"
or "trigo2exp".
Do you prefer the syntax with a parameter as rewrite (expr, source =
"trigo", target=exp)
But in this case It's impossible to compose these rewrite rules.
The syntax "_from_2_to_" allows the composed rewrite rules.
tan(x)^2 -> 1/cos(x)^2 - 1 -> 2 / (exp(I*x) . . .) - 1 -> 1/cos(x)^2 - 1
-> tan^2(x)
sage: rewrite (tan(x)^2, "tancot22sincos", "sincos2exp", "lessIinExp",
"cos22tan")
tan(x)^2
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