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f(x) = x² - 2x
f'(x) = 2x - 2
f'(x) = 0
2x - 2 = 0
2x = 2
x = 1 atau x = 0
f(1) = 1² - 2(1) = 1 - 2 = -1
f(0) = 0² - 2(0) = 0
titik maks = 1,-1
titik min = 0,0