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u = 5x - 2; u' = 5
v = 3x - 1; v' = 3
f ' (x)
= (u'v - uv') / v²
= (5(3x-1) - (5x-2)3) / (3x-1)²
= (15x - 5 - 15x - 6) / (3x-1)²
= -11 / (3x-1)² atau -11 / (9x² - 6x + 1)