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f(x) = 4 / x^½
f(x) = 4 x^⁻½
f'(x) = 4 (-½) x^⁻³/₂
f'(x) = -2 x^⁻³/₂
f'(x) = -2 / x³/₂
f'(x) = -2/√x³
Jadi, turunan pertamanya adalah -2/√x³