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(1 Δ 2) = 1 - 1/2 = 1/2
(3 Δ 4) = 1 - 3/4 = 1/4
maka (1 Δ 2) Δ (3 Δ 4) = 1 - (1/2)/(1/4)
= 1 - 2
= -1
>>>
1-=1-
=