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f(x) = 2x - 4
y = 2x - 4
2x = y + 4
x = (y + 4) / 2
f-'(x) = (x + 4) / 2
Maka :
» f-'(3) + 1
» 7/2 + 1
» 9/2
» 4 1/2
OPTION D