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f'(x) = 2x-4 ; titik puncak di f'(x) = 0
0 = 2x-4
2x = 4
x = 2 ← absis titik puncak
f(2) = 2²-4.2+6
= 2 ← ordinat titik puncak
titik puncak di (2,2)