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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0 = (76*pi*x)/3-(24000/x) // - (76*pi*x)/3-(24000/x)
24000/x-((76*pi*x)/3)+0 = 0
(-76/3)*pi*x+24000/x = 0
24000*x^-1-76/3*pi*x = 0
x^-1*(24000-76/3*pi*x^2) = 0
-76/3*pi*x^2 = -24000 // : -76/3*pi
x^2 = 18000/19*pi^-1
x^2 = 18000/19*pi^-1 // ^ 1/2
abs(x) = (18000/19)^(1/2)*pi^(-1/2)
x = (18000/19)^(1/2)*pi^(-1/2) or x = -((18000/19)^(1/2)*pi^(-1/2))
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { (18000/19)^(1/2)*pi^(-1/2), -((18000/19)^(1/2)*pi^(-1/2)) }
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