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= (- 3/13)(√3 - 4)
(√3 - √5)/(√5 + √3) = (√3 - √5)(√5 - √3) / (5 - 3)
= (1/2)(√15 - 3 - 5 + √15)
= (1/2)(2√15 - 8)
= √15 - 4