simplify : 7+root 8 / 7- root 8 + 7-root8 / 7+ root 8 ?
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(7 + √8 / 7 - √8 ) + (7 - √8 / 7 + √8)
{(7 + √8)(7 + √8) + (7 - √8)(7 - √8)} / 7² - √8²
{(7² + √8² + 2 × 7 × √8) + ((7² + √8² - 2 × 7 × √8)}/ 49 - 8
(49 + 8 + 108 + 49 + 8 - 108)/ 41
114 / 41
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