F'= 3x² -3 = 3· ( x-1) ·( x+1) are radacini x₁=1 si x₂=-1
TABEL < RADACINI < SEMN
x -∞ -1 1 +∞
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F' + + 0 - - 0 + + +
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F monoton crescatoare mdesc monoton crescatoare
mc daca x ∈(-∞, -1] U [1, ∞)
md daca x∈(-1, 1)
