integrate((x^2+1)/(x^4+1),x,0,1) can't be simplified



hi,sorry for my unclear expression. I mean

                     (%i1) integrate((x^2+1)/(x^4+1),x,0,1);
                            sqrt(2) + 2         2 - sqrt(2)
                       atan(-----------)   atan(-----------)
                              sqrt(2)             sqrt(2)
                       ----------------- + -----------------
                            sqrt(2)             sqrt(2)
should be simplified to sqrt(2)/4*%pi, say,
                       sqrt(2) + 2         2 - sqrt(2)
                  atan(-----------)   atan(-----------)
                         sqrt(2)             sqrt(2)      %pi
                  ----------------- + ----------------- = ----
                       sqrt(2)             sqrt(2)         3/2
                                                          2

is exact.
So how  can Maxima do it?

?? Mon, 28 Apr 2008 09:29:43 +0800??Juan Pablo Romero Bernal  
<jromerobernal at gmail.com> ????:

> Hi,
>
>>  How to make Maxima simplify it?
>
> You can use:
>
> (%i7) numer:true;
> (%o7)                                true
> (%i8) integrate((x^2+1)/(x^4+1),x,0,1);
>
> (%o8)                          1.110720726114594
>
> or
>
> (%i15) ev(integrate((x^2+1)/(x^4+1),x,0,1),numer:true);
> (%o15)                         1.110720726114594
>
> By default, the numer variable is set to false.
>
> Bye,
>



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