$\lim_{x\to\infty}\left(\frac{10x^5-x^2+22}{x^3+x^2+x}\right)$
$cos^2\left(2x\right)-cos\left(2x\right)=0$
$3.8-6.2$
$f\left(x\right)=3\left(2a^2-5x+1\right)$
$3^2-9x$
$\lim_{x\to0}\frac{\tan\left(x\right)-x}{x^2\tan\left(x\right)}$
$\lim_{x\to\infty}\left(\frac{\ln\left(x\right)}{x}-\frac{1}{\sqrt{x}}\right)$
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