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D( x )
5*x^2-15 = 0
5*x^2-15 = 0
5*x^2-15 = 0
5*x^2 = 15 // : 5
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in (-oo:-3^(1/2)) U (-3^(1/2):3^(1/2)) U (3^(1/2):+oo)
(-6*y-3)/(5*x^2-15) = 0
x belongs to the empty set
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