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f(x)=3x_1. f'(x) = 3
maka f'(x) = 10x/3 + 2/3
u = 5x^2+2x-6
u' = 10x + 2
v = 3x - 1
v' = 3
f'(x) = ((10x+2)(3x-1) - (5x^2+2x-6)(3)) / (3x-1)^2
= ((30x^2-4x-2) - (15x^2+6x-18)) / (9x^2-6x+1)
= (15x^2 - 10x + 16) / (9x^2 -6x+1)