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f'(X) = 5 • 3 (5x - 2)³⁻¹
f'(x) = 15 • (5x - 2)²
f'(x) = 15 • (25x² - 20x + 4)
f'(X) = 375x² - 300x + 60
Jadi, turunan pertama dari f(x) = (5x - 2)³adalah f'(X) = 375x² - 300x + 60
f ' (x) = 3 . (5x - 2)² . 5
f ' (x) = 15(5x - 2)²