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Verified answer
Jawaba = √3
u2 = 3 + √3
a . u3 = (u2)^2
u3 = (u2)^2 / (a)
u3 = (3 + √3)^2 / (√3)
u3 = (3 + √3)^ 2 (√3) / (√3)(√3)
u3 = (12+ 6√3) (√3) / (3)
u3 = (12 √3 + 18)/3
u3 = 4√3 + 6