 
 
 
split takes two arguments : an expression depending
on two variables and the list of these two variables.
If the expression may be factorized into two factors 
where each factor depends 
only on one variable, split returns the list of this two 
factors, otherwise it returns the list [0].
Input :
or :
Output :
Input :
^2*y^2-1,[x,y])Output :
 
 
