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D( x )
4*x^2-1 = 0
4*x^2-1 = 0
4*x^2-1 = 0
4*x^2 = 1 // : 4
x^2 = 1/4
x^2 = 1/4 // ^ 1/2
abs(x) = 1/2
x = 1/2 or x = -1/2
x in (-oo:-1/2) U (-1/2:1/2) U (1/2:+oo)
(6*x^2+3*x)/(4*x^2-1) = 0
6*x^2+3*x = 0
3*x*(2*x+1) = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
3*x*(x+1/2) = 0
(3*x*(x+1/2))/(4*x^2-1) = 0
( 3*x )
3*x = 0 // : 3
x = 0
( x+1/2 )
x+1/2 = 0 // - 1/2
x = -1/2
x in { -1/2}
x = 0
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