$9^{\frac{\infty}{9}}$
$\int7x^3\left(\frac{x^4}{3}+1\right)^4dx$
$-15^3$
$5x^3+25x^2-40+210$
$\frac{4}{7}-\frac{3}{2}-\frac{1}{14}$
$\lim_{x\to5}\left(\frac{x-4}{\sqrt{x+21}-5}\right)$
$t^2+6t+9$
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