$\int_{\infty}^7\left(\frac{x}{x^2-4}\right)dx$
$-10\left(2.4-3.8\right)$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)^{x^{-2}}}{x}\right)$
$5+4-6-8+19-18+15-49$
$-4a^{3}b+3ab^{2}-8a^{3}b+6a$
$\lim_{x\to12}\left(x+\pi\right)cotx$
$2z+9x+5z+3x$
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