$\lim_{x\to\infty}x^2\left(\sqrt{x^2+\frac{2}{x}}-x\right)$
$\frac{2a^2x+2a^2+2b^3x+2b^3}{2}$
$3-2x\ge5$
$6\left(9y-4\right)-3\left(6y+3\right)$
$\left(a^8-x^7\right)^3$
$\int b ^ { 4 x } d x$
$\frac{5-\sqrt{-5}}{5}$
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