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D( x )
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x^6+8*x^4)/(2*x^2) = 14*x^4 // - 14*x^4
(10*x^6+8*x^4)/(2*x^2)-(14*x^4) = 0
(10*x^6+8*x^4)/(2*x^2)-14*x^4 = 0
(10*x^6+8*x^4)/(2*x^2)+(-14*2*x^2*x^4)/(2*x^2) = 0
10*x^6-14*2*x^2*x^4+8*x^4 = 0
8*x^4-18*x^6 = 0
8*x^4-18*x^6 = 0
2*x^4*(4-9*x^2) = 0
-9*x^2 = -4 // : -9
x^2 = 4/9
x^2 = 4/9 // ^ 1/2
abs(x) = 2/3
x = 2/3 or x = -2/3
2*x^4*(x-2/3)*(x+2/3) = 0
(2*x^4*(x-2/3)*(x+2/3))/(2*x^2) = 0
(2*x^4*(x-2/3)*(x+2/3))/(2*x^2) = 0 // * 2*x^2
2*x^4*(x-2/3)*(x+2/3) = 0
( 2*x^4 )
2*x^4 = 0 // : 2
x^4 = 0
x = 0
( x+2/3 )
x+2/3 = 0 // - 2/3
x = -2/3
( x-2/3 )
x-2/3 = 0 // + 2/3
x = 2/3
x in { 0}
x in { -2/3, 2/3 }
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