hi
(I)->(II)
(C1) r*sin(a+b+c)-r*sin(a+b-c)+d*cos(a+b+c)-d*cos(a+b-c)$
(C2) ratsimp(%);
OK
(II)->(III)
(C3) r*(sin(a+b+c)-sin(a+b-c))+d*(cos(a+b+c)-cos(a+b-c))$
(C4) trigexpand(%);
(C5) trigsimp(%);
(C6) trigreduce(%);
(D6) 2 COS(b + a) SIN(c) r - 2 SIN(b + a) SIN(c) d
OK
thanks
Gosei Furuya (go_furuya@infoseek.jp)
>
> to do this reduction:
>
> (I) r*sin(a+b+c)-r*sin(a+b-c)+d*cos(a+b+c)-d*cos(a+b-c);
>
> (II) r*(sin(a+b+c)-sin(a+b-c))+d*(cos(a+b+c)-cos(a+b-c));
>
> (III) r*(cos(a+b)*sin(c))+d*(sin(a+b)*sin(c));
>
>
> 1) How can I factor r and d in (I) to get (II)?
> 2) from (II) to (III) trigexpand, factor, trigreduce do not work...
>
> bye
>
> _______________________________________________
> Maxima mailing list
> Maxima@www.math.utexas.edu
> http://www.math.utexas.edu/mailman/listinfo/maxima
>
>