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D( x )
x = 0
1360-x = 0
x = 0
x = 0
1360-x = 0
1360-x = 0
1360-x = 0 // - 1360
-x = -1360 // * -1
x = 1360
x in (-oo:0) U (0:1360) U (1360:+oo)
1360/x = x/(1360-x) // - x/(1360-x)
1360/x-(x/(1360-x)) = 0
(-1*x)/(1360-x)+1360/x = 0
(-1*x^2)/(x*(1360-x))+(1360*(1360-x))/(x*(1360-x)) = 0
1360*(1360-x)-1*x^2 = 0
1849600-x^2-1360*x = 0
1849600-x^2-1360*x = 0
1849600-x^2-1360*x = 0
DELTA = (-1360)^2-(-1*4*1849600)
DELTA = 9248000
DELTA > 0
x = (9248000^(1/2)+1360)/(-1*2) or x = (1360-9248000^(1/2))/(-1*2)
x = (1360*5^(1/2)+1360)/(-2) or x = (1360-1360*5^(1/2))/(-2)
(x-((1360*5^(1/2)+1360)/(-2)))*(x-((1360-1360*5^(1/2))/(-2))) = 0
((x-((1360*5^(1/2)+1360)/(-2)))*(x-((1360-1360*5^(1/2))/(-2))))/(x*(1360-x)) = 0
((x-((1360*5^(1/2)+1360)/(-2)))*(x-((1360-1360*5^(1/2))/(-2))))/(x*(1360-x)) = 0 // * x*(1360-x)
(x-((1360*5^(1/2)+1360)/(-2)))*(x-((1360-1360*5^(1/2))/(-2))) = 0
( x-((1360*5^(1/2)+1360)/(-2)) )
x-((1360*5^(1/2)+1360)/(-2)) = 0 // + (1360*5^(1/2)+1360)/(-2)
x = (1360*5^(1/2)+1360)/(-2)
( x-((1360-1360*5^(1/2))/(-2)) )
x-((1360-1360*5^(1/2))/(-2)) = 0 // + (1360-1360*5^(1/2))/(-2)
x = (1360-1360*5^(1/2))/(-2)
x in { (1360*5^(1/2)+1360)/(-2), (1360-1360*5^(1/2))/(-2) }
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