ratsimp(trigreduce(...))
On Tue, Jan 24, 2012 at 05:00, Marco Frigerio <marco.frigerio at iit.it> wrote:
> Hi all,
>
> consider this
>
> (%i..) trigreduce( -A*cos(q1)*sin(q2) + A*sin(q1)*cos(q2) );
> (%o..) - sin(q2 - q1) A
>
> Why I cannot do the same thing if instead of a variable like 'A' I have a
> numerical constant?
>
> (%i..) trigreduce( -4*cos(q1)*sin(q2) + 4*sin(q1)*cos(q2) );
>
> sin(q2 + q1) sin(q2 - q1) sin(q2 + q1) sin(q2 - q1)
> (%o..) 4 (------------ - ------------) - 4 (------------ + ------------)
> 2 2 2 2
>
> I would really like to see
> - sin(q2 - q1) 4
>
> How can I achieve this?
>
> Thanks a lot
> Regards,
> MF
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