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D( x )
12-(4*x^2) = 0
12-(4*x^2) = 0
12-(4*x^2) = 0
12-4*x^2 = 0
-4*x^2 = -12 // : -4
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)
(3*x^2)/(12-(4*x^2)) = 0
(3*x^2)/(12-4*x^2) = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x = 0
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