упростите выражение х²-(х-1)(х+1)
x^2 - (x^2 - 1^2) = x^2 - x^2 + 1 = 1
x^2-(x-1)(x+1)= x^2-(x^2-1)= x^2-x^2+1=1
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x^2 - (x^2 - 1^2) = x^2 - x^2 + 1 = 1
x^2-(x-1)(x+1)= x^2-(x^2-1)= x^2-x^2+1=1