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D( x )
162*x^5 < 0
(2*x)^1 = 0
162*x^5 < 0
162*x^5 < 0
162*x^5 < 0
162*x^5 < 0 // : 162
x^5 < 0/162
x^5 < 0
x^5 < 0 // ^ 1/5
x < 0
x in (-oo:0)
(2*x)^1 = 0
(2*x)^1 = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (0:+oo)
(((162*x^5)^(1/4))/((2*x)^1))/4 = 0
(((162*x^5)^(1/4))/(2*x))/4 = 0
((3*2^(1/4))/8)*x^(1/4) = 0 // : (3*2^(1/4))/8
x^(1/4) = 0
x = 0
x in { 0}
x belongs to the empty set
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