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pkau u'v - uv' / v²
u = 4
u' = 0
v = x
v' = 1
u'v - uv' / v²
= (0)(x) - (4)(1) / (x)²
= -4 / x²
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atau :
4 / x = 4x⁻¹
turunannya = -4x⁻²
= -4 / x²