factorise :a-b-a^2+b^2
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so......
a - a ^2 - b + b^2
a ( 1 - a ) - b ( 1 + b )
( a - b ) ( 1 - a ) ( 1 + b )
a - a ^2 - b + b^2
a ( 1 - a ) - b ( 1 + b )
( a - b ) ( 1 - a ) ( 1 + b )
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