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a)
x² - 4 ≠ 0
(x + 2)(x - 2) ≠ 0
x ≠ -2
x ≠ 2
D = R \ {-2; 2}
b)
x² - 2x ≠ 0
x(x - 2) ≠ 0
x ≠ 0
x ≠ 2
D = R \ {0; 2}