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$\frac{d}{dx}({\displaystyle \underset{e}{\overset{x^3}{}}}ln(t^2+1)dt)$

Aln$(x^6+1)-ln(e^2+1)$

$B3x^2(ln(x^6+1)-ln(e^2+1))$

$C3x^{2}ln(x^6+1)$

$D3x^{2}ln(x^2+1)$

Eln$(x^6+1)$