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misal : U = (2x-1)
du/dx= turunan U
du/dx = 2
du=2 dx
dx=1/2 du
jadi : integral U^-3 × dx
integral U^-3 × 1/2 du
= 1/2×-1/2 U^-2
=-1/4 U^-2
= -1/4 (2x-1)^-2