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dikatakan fungsi naik jika f'(x) > 0
3 - 3x² > 0
1 - x² > o
(1 - x)(1 + x)>0
pakai garis bilangan
---------- +++++++ -------
.............o................o...........
-1 1
kurva f(x) = 3x - x³ akan naik pada interval -1 < x <1