rationalise
1/
(√52 +√3 +√9)
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=1/(√52 +√3 +√9) × (√52 - √3 - √9) /
= (√52 - √3 - √9)
= (√52 - √3 - √9)/ (√52)² - (√3)² - (√9)²
= (√52 - √3 - √9)/9
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