Calculus bug in the latest 7.2.beta: sin(pi*x) returns 0 whenever x > 0

[Eric Gourgoulhon]

Hi,

In Sage 7.2.beta4:

sage: assume(x>0)
sage: sin(pi*x)
0

As far as I can tell, this bug has been introduced in Sage 7.2.beta0. Maybe by ticket #20134 (upgrade to pynac-0.6.4) ?

Best wishes,

Eric.

[Ralf Stephan]

Many thanks for reporting but who will open the ticket?

[Volker Braun]

It seems that the assumption (wrongly) thinks that x is integer:

sage: assume(x>0)

sage: sin(pi*x)

0

sage: cos(pi*x)

(-1)^x

[Ralf Stephan]

On Sunday, April 17, 2016 at 9:05:46 PM UTC+2, Volker Braun wrote:

It seems that the assumption (wrongly) thinks that x is integer:

http://trac.sagemath.org/ticket/20456

Fixed in newest Pynac.

[Eric Gourgoulhon]

Thanks !

Eric.