$\left(2x+9\right)^2-\left(x-3\right)^2$
$f\left(x\right)=\left(x-3\right)\left(x-2\right)-\left(x-2\right)\left(1-x\right)+\left(1-x\right)$
$\lim_{x\to\infty}\left(\frac{3x+7}{8x^2+3x-5}\right)$
$k^2+11k^230$
$x^2\sqrt{x^3}-5x\sqrt{x^7}-4\sqrt{x^9}-5x^{-2}\sqrt{x}$
$\left(2\cdot4+12\right)\left(6-4\right)$
$\lim_{x\to\infty}\left(\frac{x+8}{x+7}\right)^x$
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