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f´(X) = 3[4X^(3 - 1)] - 5
f´(X) = 3(4X²) - 5
f´(X) = 12X² - 5
Para X = 1/2 = 0.5
f¨(0.5) = 12(0.5)² - 5
f´(0.5) = 12(0.25) - 5
f´(0.5) = 3 - 5
f´(0.5) = -2