Le lundi 11 février 2013 10:17:58 UTC+1, jori.ma...@uta.fi a écrit :
>
> solve(sin(x) == cos(x),x)
>
> --> [sin(x) == cos(x)]
>
> solve([sin(x) == cos(x),sin(x) == cos(x)],x)
>
> --> [[x == 1/4*pi + pi*z31]]
>
> ??
>
I *think* that by using a system of equations, you are somehow forcing the
use of to_poly_solve, notoriously much better than Maxima's solve() at trig
and log equations. BTW, from Sage :
solve(sin(x)==cos(x), x, to_poly_solve=True) ==> [x == 1/4*pi + pi*z31],
which is the expected result.
This problem has been known in Maxima fo a loooong time (as can be
understood/inferred by various sarcastic allusions of the Maxima list
old-timers...). I think that to_poly_solve (a. k. a. %solve) has been
written by (IIRC) Barton Willis in order to aleviate this (and similar)
problems.
HTH (but I doubt it...),
Emmanuel
Charpentier
> --
> Jori M�ntysalo
>
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