rationalise the denominator of 1/ root7 + root 6 - root13
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1/√7 + √6 - √13
(1/√7 * √7/√7) + √6 - √13
√7 /7 + √6 - √13
(1/√7 * √7/√7) + √6 - √13
√7 /7 + √6 - √13
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