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= (2.La):a
= (2(x²-4)):(x+2)
= (2(x+2)(x-2)):(x+2)
= 2(x-2)
= 2x-4
X2 - 4 = 1/2 x (X+2) x t
X2 - 4 = 1/2X + 1 x t
t = x2 - 1/2X + 4 - 1
t = x2 - 1/2X + 3