Variables in Maxima




  How can I modify the variables to get : 
> 
>           log(a/b) = log(a) - log (b)
>           
>           log(a^x) =xlog(a)
>   
>           sin(x/2)=sqrt((1-cosx)/2) 
                     
            2^(x+y)=2^x*2^y ?
  

 How can I get a copy of Macsyma 2.4 demo ( 30 Mb) ?

 Thanks a lot

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