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sisa = 4(1/2)^4 - 3(1/2)^3 + 5(1/2) - 3
= 1/4 - 3/8 + 5/2 - 3
= 2/8 - 3/8 + 20/8 - 24/8
= (2 - 3 + 20 - 24)/8
= - 5/8