√(3+6√3+9) +√(3-6√3+9)= √(√3+3)²+√(√3-3)²= √3+3+3-√3= 6
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√(3+6√3+9) +√(3-6√3+9)= √(√3+3)²+√(√3-3)²= √3+3+3-√3= 6