$\cot x\cdot\sin x+\sin x\cdot\cos x+1$
$x^2+21x+1$
$\lim_{x\to\infty}\left(\frac{\sqrt[3]{x}-8}{x-6}\right)$
$-3f-9f$
$1x^2+50x+25$
$-2x+\frac{4}{5}\le0.5x-2.2$
$15.8\cdot2.7$
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