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D( x )
10*v^8*x^4 < 0
5*v^3*x^4 < 0
10*v^8*x^4 < 0
10*v^8*x^4 < 0
10*v^8*x^4 = 0
10*v^8*x^4 = 0 // : 10*v^8
x^4 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
5*v^3*x^4 < 0
5*v^3*x^4 < 0
5*v^3*x^4 = 0
5*v^3*x^4 = 0 // : 5*v^3
x^4 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x in <0:+oo)
(5*v^3*x^4)^(1/2)*(10*v^8*x^4)^(1/2) = 0
5^(1/2)*10^(1/2)*v^(11/2)*x^4 = 0 // : 5^(1/2)*10^(1/2)*v^(11/2)
x^4 = 0
x = 0
x = 0
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