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dngan rumus abc p1= (-1+ √(1 - 4√3 .(-√3))/(2√3)
p1= (-1 + √13)/(2√3) = 1/6(-√3 +√39)=1/6(√39-√3)
p2 =(-1 - √13)/(2√3) = 1/6(-√3 -√39) ... tak mungkin hasil negatif