x minus 1 into X + 1 equal to
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as we know
(a+b)(a-b) =a^2-b^2
here a=x b=1
(x+1)(x-1)=x^2-1
(a+b)(a-b) =a^2-b^2
here a=x b=1
(x+1)(x-1)=x^2-1
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