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= ( (-1) (- √2 / 2) 1 ) / (1/2 x - √2 / 2)
= (√2 / 2) / √2 / 4
= √2 / 2 x 4 / √2
= 2
=(-1)(-1/2 akar 2)(-1) per (1)(-1/2 akar 2)
=(-1/2 akar 2) per (-1/2 akar 2)
= 1