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D( x )
3*x^2-5 = 0
3*x^2-5 = 0
3*x^2-5 = 0
3*x^2 = 5 // : 3
x^2 = 5/3
x^2 = 5/3 // ^ 1/2
abs(x) = (5/3)^(1/2)
x = (5/3)^(1/2) or x = -(5/3)^(1/2)
x in (-oo:-(5/3)^(1/2)) U (-(5/3)^(1/2):(5/3)^(1/2)) U ((5/3)^(1/2):+oo)
(x^2+7)/(3*x^2-5) = 0
1*x^2 = -7 // : 1
x^2 = -7
x belongs to the empty set
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