find rationalising factor of 1+√7/1-√7
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1+√7/1-√7
1+√7×1+√7/1-√7×1+√7
(1+√7)^2/1-7
1+7+2√7/-6
8+2√7/-6
4+√7/-3
-4-√7/3
1+√7×1+√7/1-√7×1+√7
(1+√7)^2/1-7
1+7+2√7/-6
8+2√7/-6
4+√7/-3
-4-√7/3
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