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DE^2 = EN^2 + DN^2 = x^2 + 36/x^2 = 4¢å6/3 + 36/(4¢å6/3) = 4¢å6/3 + 9¢å6/2 = 35¢å6/6
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= (- a^2 + (b + c)^2)(a^2 - (b - c)^2)
= - a^4 + 2(b^2 + c^2)a^2 - (b^2 - c^2)^2
= - (16¢å6/5)^2 + 2(144¢å6/35 + 32¢å6/7)(16¢å6/5) - (144¢å6/35 - 32¢å6/7)^2
= - 1536/25 + 2(304¢å6/35)(16¢å6/5) - (16¢å6/35)^2
= - 1536/25 + 58368/175 - 1536/1225
= (- 75264 + 408576 - 1536)/1225
= 331776/1225
S^2 = 20736/1225 = (2^8 * 9^2)/35^2 = (144/35)^2
S = 144/35
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