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u' = 4
v' = 3
f(x) = u'.v - v'.u / v^2
= 4(3x+1) - 3(4x-2)/(3x+1)^2
= 12x+4 - 12x + 6/9x^2 + 6x + 1
= 10/9x^2 + 6x + 1
maaf kalau salah