Rationalise the denominator 2/root2+root3+root5 where 2 is the numerator and the roots are the denominators
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→2/(√2 + √3) + √5 ×[(√2 +√3) -√5/(√2 +√3) -√5]
→(2√2 + 2√3 -2√5)/2 + 3 +2√6 - 5
→(2√2 + 2√3 - 2√5)/2√6 × √6/√6
→2√12 + 2√18 - 2√30/12
→4√3 + 6√2 - 2√30/12
→2√3 + 3√2 - √30/6
→(2√2 + 2√3 -2√5)/2 + 3 +2√6 - 5
→(2√2 + 2√3 - 2√5)/2√6 × √6/√6
→2√12 + 2√18 - 2√30/12
→4√3 + 6√2 - 2√30/12
→2√3 + 3√2 - √30/6
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