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turunkan kedua ruas:
3f '(3x + 2) = √(x + 1) - x/√(x + 1)
untuk x = 2 maka:
3f ' (8) = √4 - 2/√4
3f ' (8) = 2 - 1
3f ' (8) = 1 (kalikan 3)
9f ' (8) = 3