$\lim_{x\to\infty}\left(\frac{sin\left(\frac{2}{x}\right)}{x^{-1}}\right)$
$\lim_{x\to5}\left(\frac{x^2-5}{x^2-10x+25}\right)$
$\cos^{2}\alpha+1$
$-x^2+6x-4+x^3-3x^2+6x-4$
$x^2-21x+20<0$
$\left(\frac{2}{3}a-\frac{1}{2}b\right)^3$
$12x+4=8x+16$
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