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Misal:
u= x+1 maka u' = 1
v= 2x-1 maka v' = 2
f'(x) = (u' v - u v')/v^2 = (1(2x-1) - (x+1)2) / (2x-1)^2 = (2x-1 - 2x - 2) / (2x-1)^2 = -3/(2x-1)^2