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12. Calculaţi: a) (√2+√3)² + (√2-√3)²; c) (2√2-√√6)²+(4+√3)²; 13. Calculaţi: b)(√2+√√5)²-(√√2-√√5)²; d) (3√3-√√6)²-(9-√2)². [4)²-6√√x+√√/2)²:​