$\lim_{x\to-1}\left(5x^2-9x+7\right)$
$-2u^2+u$
$-5cos^2x-2sinx-2$
$\sqrt{2.3^2}.5^7$
$\int\left(3x^3+4x^4-2x-10\right)dx$
$\lim_{x\to\infty}\left(\frac{7x_{+11}}{19x+17}\right)$
$y''-9y=0$
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