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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-3 = 60/(x^2)-9 // - 60/(x^2)-9
10/x-(60/(x^2))-3+9 = 0
10/x-60*x^-2-3+9 = 0
10*x^-1-60*x^-2+6 = 0
t_1 = x^-1
10*t_1^1-60*t_1^2+6 = 0
10*t_1-60*t_1^2+6 = 0
DELTA = 10^2-(-60*4*6)
DELTA = 1540
DELTA > 0
t_1 = (1540^(1/2)-10)/(-60*2) or t_1 = (-1540^(1/2)-10)/(-60*2)
t_1 = (2*385^(1/2)-10)/(-120) or t_1 = (-2*385^(1/2)-10)/(-120)
t_1 = (2*385^(1/2)-10)/(-120)
x^-1-((2*385^(1/2)-10)/(-120)) = 0
1*x^-1 = (2*385^(1/2)-10)/(-120) // : 1
x^-1 = (2*385^(1/2)-10)/(-120)
-1 < 0
1/(x^1) = (2*385^(1/2)-10)/(-120) // * x^1
1 = ((2*385^(1/2)-10)/(-120))*x^1 // : (2*385^(1/2)-10)/(-120)
-120*(2*385^(1/2)-10)^-1 = x^1
x = -120*(2*385^(1/2)-10)^-1
t_1 = (-2*385^(1/2)-10)/(-120)
x^-1-((-2*385^(1/2)-10)/(-120)) = 0
1*x^-1 = (-2*385^(1/2)-10)/(-120) // : 1
x^-1 = (-2*385^(1/2)-10)/(-120)
-1 < 0
1/(x^1) = (-2*385^(1/2)-10)/(-120) // * x^1
1 = ((-2*385^(1/2)-10)/(-120))*x^1 // : (-2*385^(1/2)-10)/(-120)
-120*(-2*385^(1/2)-10)^-1 = x^1
x = -120*(-2*385^(1/2)-10)^-1
x in { -120*(2*385^(1/2)-10)^-1, -120*(-2*385^(1/2)-10)^-1 }
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