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integral (x²-2x)²/x² dx
integral (x²-2x)(x²-2x)/x² dx
integral (x⁴-2x³-2x³+4x²/x² dx
integral (x⁴-4x³+4x²)/x² dx
= x²-4x+4
= 1/3 x³-4/2 x²+ 4x +c
= 1/3 x³-2x²+4x+c