(√12+√3)²=(√12)²+2*√12*√3+(√3)²=12+2*2√3*√3+3=12+2*2*3+3=12+12+3=12+15=27
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(√12+√3)²=(√12)²+2*√12*√3+(√3)²=12+2*2√3*√3+3=12+2*2*3+3=12+12+3=12+15=27