$7\cdot40$
$\frac{x-1}{x}\le2$
$\sqrt{24x}$
$\left(2a^2-5\right)\left(2a^2+5\right)$
$\lim_{x\to\infty}\left(\frac{\left(1+4x^2\right)}{x^2}\:\:\right)$
$\int x^3e^{7x}dx$
$\left(x+2-x^2\right)^2$
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