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Verified answer
(2x - 1)^2=(2x)^2 + 2.2x.(-1) +(-1)^2
=4x^2 - 4x + 1
Verified answer
= (2x)'2 - 2 × 2x × 1 + 1'2= 4x'2 - 4x+1
...salah maaf, uda berusaha:)