OK Michael, thanks for this.

But my problem was

solve(sin(x)/cos(x)==1,x,to_poly_solve="force")


returns an empty solution set, implying that there are no solutions
when in fact there are.  Surely this is misleading?

Worthy of a bug report?  IDK

best wishes

Robin





On Wed, Jun 12, 2013 at 8:54 AM, Michael Orlitzky <mich...@orlitzky.com> wrote:
> On 06/11/2013 04:43 PM, robin hankin wrote:
>> hello.  Sage 5.9:
>>
>> sage: solve(sin(x)/cos(x)==1,x,to_poly_solve="force")
>> []
>>
>>
>>
>> I find this unexpected because pi/4 is a solution,  and sage seems to
>> indicate that there are no solutions.
>>
>>
>> Sage can handle the equation if I do some preprocessing:
>>
>> sage: solve(tan(x)==1,x,to_poly_solve='force')
>> [x == 1/4*pi + pi*z219]
>>
>
> Try to_poly_solve=True.
>
>
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-- 
Robin Hankin
Uncertainty Analyst
hankin.ro...@gmail.com

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