∫（（x-1）/（x²+1））dx

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∫（（x-1）/（x²+1））dx∫（（x-1）/（x²+1））dx∫（（x-1）/（x²+1））dx

∫（（x-1）/（x²+1））dx
∫（（x-1）/（x²+1））dx

∫（（x-1）/（x²+1））dx