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f'(x) = 3x² - 2x
m = f'(2)
= 3. 2² - 2 .2
= 12 - 4
= 8
persamaan garis singgung
y - b = m (x - a)
y - 8 = 8 (x - 2)
y - 8 = 8x - 16
y = 8x - 16 + 8
y = 8x - 8