all identities in x, y, z
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Answer:
(x+y)^2= x^2+y^2+2xy.......
(x-y) ^2=x^2+y^2-2xy.......
(x^2-y^2)=(x+y) (x-y)......
(x+a)(x+b)=x^2+(x+y)x+xy.....
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