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(2a-1)(1+2a) = 2a + 4a²-1-2a = 4a² - 1
(1-3ax)(3ax +1) = 3ax+1-9a²x²-3ax = 1 - 9a²x²
(x+y-2) (x-y+2) = x² -xy+2x+ xy -y²+2y-2x +2y-4 = x² - y² + 4y - 4