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(y-x)^3*(x+y)^3+(x-y)^3*(y+x)^2
=(y-x)^3*(x+y)^3+[-(y-x)^3*(x+y)^2]
=(y-x)^3*(x+y)^3-(y-x)^3*(x+y)^2
=(y-x)^3*(x+y)^2*[(x+y)-1]
==(y-x)^3*(x+y)^2*(x+y-1).
=(y-x)^3*(x+y)^3+[-(y-x)^3*(x+y)^2]
=(y-x)^3*(x+y)^3-(y-x)^3*(x+y)^2
=(y-x)^3*(x+y)^2*[(x+y)-1]
==(y-x)^3*(x+y)^2*(x+y-1).
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(y-x)^3[(x+y)^3-(y+x)^2]
=(y-x)^3(x+y)^2[x+y-1]
=(y-x)^3(x+y)^2[x+y-1]
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(y-x)^3(x+y)^3+(x-y)^3(y+x)^2
=(y-x)^3(x+y)^3-(y-x)^3(y+x)^2
=(y-x)^3(y+x)^2[x+y-1]
(y-x)^3(x+y)^3+(x-y)^3(y+x)^3
=(y-x)^3(x+y)^3-(y-x)^3(y+x)^3
=0
=(y-x)^3(x+y)^3-(y-x)^3(y+x)^2
=(y-x)^3(y+x)^2[x+y-1]
(y-x)^3(x+y)^3+(x-y)^3(y+x)^3
=(y-x)^3(x+y)^3-(y-x)^3(y+x)^3
=0
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