On Wed, Apr 23, 2008 at 11:52 AM, Hector Villafuerte <[EMAIL PROTECTED]> wrote:
>
>
> On Wed, Apr 23, 2008 at 9:39 AM, William Stein <[EMAIL PROTECTED]> wrote:
> >
> > On Wed, Apr 23, 2008 at 8:34 AM, Hector Villafuerte <[EMAIL PROTECTED]>
> wrote:
> > >
> > > Hi,
> > > I haven't been able to 'expand' trigonometric functions in Sage using
> > > identities such as:
> > > sin(x + y) = sin(x)*cos(y) + sin(y)*cos(x)
> > >
> > > Is this currently implemented?
> >
> > sage:
> > sage: var('x,y')
> > (x, y)
> > sage: f = sin(x+y)
> > sage: f.tri[tab key]
> > f.trig_expand f.trig_simplify
> > sage: f.trig_expand()
> > cos(x)*sin(y) + sin(x)*cos(y)
> > sage:
> >
>
>
> Now, that's beautiful :)
>
> I was not able to find it because I was assuming (mistakenly) that
> search_doc also goes over docstrings. In this case, the following is
> not very helpful:
> sage: search_doc('trigonometric')
>
Search_doc just searches the sage reference manual,
which is mostly a subset of docstrings. It's a primitive
function I wrote in an hour. Something better would be
greatly appreciated.
> I should've tried search_src instead:
> search_src('trigonometric')
>
> Wouldn't it be a good idea for search_doc to search docstrings as well?
YES!
William
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