This is a bug. Can you open an issue for it?
Aaron Meurer
On Mar 26, 2011, at 8:46 AM, Yuri Karadzhov wrote:
>> This actually can be solved with SymPy already:
>>
>> In [1]: var('t')
>> Out[1]: t
>>
>> In [2]: (f(x)+2*x+sin(y+cos(t))).atoms(Function)
>> Out[2]: set(cos(t), f(x), sin(y + cos(t)))
>
> In [97]: var('t')
> Out[97]: t
>
> In [98]: (f(x)+2*x+sin(y+cos(t))).atoms(Function)
> Out[98]: set(f(x), sin(y + cos(t)))
>
> So it can't
>
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