Oops, case 4 ended at the end of the message...
On 2 fév, 15:06, Nicolas wrote:
> Here is some to-my-opinion strange behaviour of trig_expand :
>
> #Declare real variables
> var('a b c')
> assume([a,'real'],[b,'real'],[c,'real'])
> assumptions()
> ---> [a is real, b is real, c is real]
>
> #Case
Dear Nicolas,
If you do
sage: a = sin((a+b)/c)
sage: a.trig_expand??
you will see the source code, which simply uses one of Maxima's
expansion routines, whose behavior should be documented on the Maxima
Sourceforge site. My suspicion is that Maxima declines to expand this
because c might be zer
Thanks for your answer !
Following your idea, ny playing around in maxima, I found that :
trigreduce(sin((a+b)/c))
> sin(b/c+a/c)
Therefore
trigexpand(trigreduce(sin((a+b)/c)))
> cos(a/c)*sin(b/c)+sin(a/c)*cos(b/c)
Which is what is wanted
but I did not find any trigreduce in sage
Any i
On Feb 2, 3:06 pm, Nicolas wrote:
> Here is some to-my-opinion strange behaviour of trig_expand :
>
> #Declare real variables
> var('a b c')
> assume([a,'real'],[b,'real'],[c,'real'])
> assumptions()
> ---> [a is real, b is real, c is real]
>
> #Case 1
> sin(a+b).trig_expand()
> ---> sin(a)*cos(b)
On 2 ún, 18:11, andrejv wrote:
>
> I don't know how to change sin((x+y)/a) to sin(x/a + y/a) in Sage,
> maybe someone else can help you with that.
This is expand from Maxima
sage: sin((a+b)/c)._maxima_().expand().sage()
sin(a/c + b/c)
Robert
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On 2 ún, 17:38, Nicolas wrote:
> Thanks for your answer !
>
> Following your idea, ny playing around in maxima, I found that :
>
> trigreduce(sin((a+b)/c))
> > sin(b/c+a/c)
>
> Therefore
> trigexpand(trigreduce(sin((a+b)/c)))
> > cos(a/c)*sin(b/c)+sin(a/c)*cos(b/c)
> Which is what is wan
On Feb 2, 3:10 pm, "ma...@mendelu.cz" wrote:
> On 2 ún, 17:38, Nicolas wrote:
>
>
>
> > Thanks for your answer !
>
> > Following your idea, ny playing around in maxima, I found that :
>
> > trigreduce(sin((a+b)/c))
> > > sin(b/c+a/c)
>
> > Therefore
> > trigexpand(trigreduce(sin((a+b)/c)))
