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D( x )
12*x^4 = 0
12*x^4 = 0
12*x^4 = 0
12*x^4 = 0 // : 12
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*w^2*x^2-(16*v^6*x))/(12*x^4) = 0
(4*w^2*x^2-16*v^6*x)/(12*x^4) = 0
4*w^2*x^2-16*v^6*x = 0
4*x*(w^2*x-4*v^6) = 0
w^2*x-4*v^6 = 0 // + -4*v^6
w^2*x = -(-4*v^6) // : w^2
x = (-(-4*v^6))/(w^2)
x = (4*v^6)/(w^2)
4*x*(x-4*v^6*w^-2) = 0
(4*x*(x-4*v^6*w^-2))/(12*x^4) = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x-4*v^6*w^-2 )
x-4*v^6*w^-2 = 0 // + -4*v^6*w^-2
x = -(-4*v^6*w^-2)
x = 4*v^6*w^-2
x in { 0}
x = 4*v^6*w^-2
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