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————— =
√6 + √13
(√6 - √13)(√6 - √13)
——————————— =
√6 + √13 x √6 - √13
√36 - √78 - √78 + √169
————————————— =
√36 - √169
√36 - √156 + √169
——————————— =
√36 - √169
6 - √4.39 + 13
———————— =
6 - 13
19 - 2√39
—————–
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