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= 2^2 - 2(2)(1/akar 2) + (1/akar 2)^2
= 4 - 4/akar 2 + 1/2
= 9/2 - 4/akar 2 × akar 2 / akar 2
= 9/2 - 4 akar 2 / 2
= 9 - 4 akar 2 / 2