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= akar ( 16x2) + 2 akar( 4 x 3) - 4
= 4 akar 2 + 4 akar 3 - 4
= 4 ( akar 2 + akar 3 - 1)
= √16x2 + 2√4x3-4
= 4√2 + 2.2√3-4
= 4√2 + 4√3-4
=4 (√2+√3-4)