I need something more general
On Thursday, February 26, 2015 at 7:50:15 PM UTC+2, John Peterson wrote:
>
>
>
> On Thursday, February 26, 2015 at 8:32:11 AM UTC-7, Paul Royik wrote:
>>
>> What is the best way to convert sqrt(x)*sqrt(x-4) to sqrt(x^2-4x) or
>> (x^2+5x+4)/sqrt(x)/sqrt(x-4) to (x^2+5x+4)/sqrt(x^2-4x)
>>
>> I tried replace, but it doesn't work in second case.
>>
>
> Be careful, they aren't equal for all values of x, but subs() will do this
> if you are willing to be explicit...
>
> #!/usr/bin/env python
>> from sympy import *
>> print sympify('(x**2 + 5*x + 4) / sqrt(x) /
>> sqrt(x-4)').subs(sympify('sqrt(x)*sqrt(x-4)'), sympify('sqrt(x**2 - 4*x)'))
>
>
> Output:
>
> (x**2 + 5*x + 4)/sqrt(x**2 - 4*x)
>
>
>
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