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The identity used in simplifying 101 xx ...

The identity used in simplifying `101 xx 99` is

A

`(a+b)(a-b)=a^2-b^2`

B

`(a - b)^2 -= a^2- 2ab +b^2`

C

`(a + b)^2 -= a^2+ 2ab + b^2`

D

`(x + a) (x + b) -=x^2 (a + b)x+ab`

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