2. (3 √ 5 + 2 √ 6) (2 √ 6-3 √ 5) 3.√2(√2-√6)+(1+√3)(1-√3) 4.(2√3-3√2)(2√2+√3)

2. (3 √ 5 + 2 √ 6) (2 √ 6-3 √ 5) 3.√2(√2-√6)+(1+√3)(1-√3) 4.(2√3-3√2)(2√2+√3)

1. Original formula = (2 √ 3) 2 + (3 √ 2) 2-2 × 2 √ 3 × 3 √ 2 = 12 + 18-12 √ 6 = 30-12 √ 62. Original formula = (2 √ 6) 2 - (3 √ 5) 2 = 24-45 = - 213. Original formula = 2-2 √ 3 + 1-3 = - 2 √ 34. Original formula = 2 √ 3 × 2 √ 2 + 2 √ 3-3 √ 2 × 2 √ 2-3 √ 2 × √ 3 = √ 96 + 6-12 - √ 54 = - 6 + 4 √ 6-3 √ 6 = - 6 +