On Friday, September 6, 2013 12:52:44 PM UTC+4, Christophe Bal wrote:
>
> It sounds like weird becaus when I type 1/2+3/7, sympy returns 13/14. 
> This means that sympy knows to workd with exact fractions, I know that 
> about sympy, but in asin(1/2), 1/2 is seen as a float. Stange ! Isn-t it ?
>
>
1/2 is not an exact fraction.  Rational(1, 2) is.

Please, take look on the documentation, especially this chapter:
http://docs.sympy.org/0.7.3/gotchas.html#python-numbers-vs-sympy-numbers

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