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➡️ √7 - √5 / √7 + √5
[ Multiply and divide "√7 + √5 " on both sides ]
➡️ √7 - √5 / √7 + √5 × √7 + √5 / √7 + √5
➡️ ( √7 )² - ( √5 )² / (√7)² + (√5)² + 2.√7 .√5
➡️ 7 - 5 / 7 + 5 + 2.√35
➡️ 2 / 12 + 2√35
OR
➡️ 2 / 14 √35
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