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3*∫x/(x²-7) dx
u=x²-7 , du=2x dx
3∫1/(2u)=3/2*ln u du
po podstawieniu:
3/2*ln(x²-7)
|3/2*ln(x²-7)|⁴₃ = 3/2*(ln9-ln2)=ln27 - 3/2*ln2