I want to omit the independent variable

for example:

> alias(f = f(x+y, z+y));
print(`output redirected...`); # input placeholder
                               f
> f1 := z = f(x+y, z+y);
print(`output redirected...`); # input placeholder
       ...

How to edit the tex generated by the maple:Put the one equation into several rows

For example

This code p57.txt  can get the below picture

[IMG]http://i730.photobucket.com/albums/ww309/ytyyutianyun/1-13.png[/IMG]

But what I want is

[IMG]http://i730.photobucket.com/albums/ww309/ytyyutianyun/2-7.png[/IMG]

Thanks

p57.txt

This is my code help thanks

I've the equation

(-x^2+eta^2+2*x*xi+2*x*eta-xi^2-2*xi*eta-2*x*y-2*y*eta+2*xi*y+y^2)*(-x^2-2*x*eta+eta^2+2*x*xi+2*xi*eta-xi^2+2*x*y-2*xi*y-2*y*eta+y^2)-(x-xi)^4+6*((x-xi)^2)(-y+eta)^2-(-y+eta)^4

The answer is 0

But I can't get the answer by simplify and expand

Then which .Thanks

How to solve the  partial derivative at a specified point

The latex code is

f(x,y)=x+(y-1)\arcsin\sqrt{\frac{\,x}{y}}

f''_{xx}(x,1)