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α x β = α/2
β = 1/2
α + β = - 1/2
α + 1/2 = - 1/2
α = - 1
maka barian :
(-1) , (1/2) , (-1/4) -------> r = -1/2
suku ke empat = U3 x r
===========> (- 1/4) x (- 1/2)
===========> 1/8
===========> C.