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α + β = 1 - a
2β + β = 1 - a
3β = 1 - a
β = (1 - a)/3
αβ = 2
2β² = 2
β² = 1
β = - 1 (ambil yg < 0 agar a > 0)
maka:
- 1 = (1 - a)/3
- 3 = 1 - a
a = 4