$\lim\:_{x\to\:\:+\infty\:\:}\left(\frac{x+3}{x-2}\right)$
$\left(x-a\right)\cdot\left(x^3+x^2a+xa^2+a^3\right)$
$16+40x^2$
$\sin\left(x\right)\cdot\left(1+\cos\left(2x\right)\right)=\cos\left(x\right)$
$\lim_{x\to infinity}\left(n\:\cdot\:\sin\left(\frac{\pi}{n}\right)\right)$
$tan^2\:xcos^2\:x=sin^2\:x$
$\frac{x+3}{3x-2}\le2$
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