Question: Use integration by substitution to find

1. \(\int{\left( 3{{x}^{2}}-1 \right){{\left( {{x}^{3}}-x \right)}^{5}}dx}\)
2. \(\int{3x{{e}^{{{x}^{2}}+1}}dx}\)
3. \(\int{x\sqrt{3{{x}^{2}}-1}dx}\)
4. \(\int{\frac{dx}{3-x}}\)

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