$\int\frac{2x+7}{x^2+2x-5}dx$
$4c^2-20cd+25d^2$
$-10+6-7-9+3+1-5$
$\lim_{x\to\infty}\left(-2xe^{-\sqrt{x}}\right)$
$4ln3tx6cos3t$
$\int x\left(9x^2+4\right)^8dx$
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