$3x^2-10x+48$
$\lim_{x\to+\infty}\left(1+\frac{3}{x}\right)^2$
$16\:+x=35$
$5a+25ab$
$\left(9-c\right)^2$
$\sec\left(x\right)\cdot\left(1+\cot^2\left(x\right)\right)$
$\lim_{x\to+\infty}\cos\left(\frac{x+2}{x^2}\right)$
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