$\frac{d^2}{dx^2}\left(x\cdot\cos\left(x\right)\right)x^2\sqrt{x}-5x$
$\lim_{x\to0}\left(\frac{6x}{x^2+2x}\right)$
$+b+2b-3b$
$n^2+8n-180$
$\lim_{x\to\infty}\left(\frac{2e^x-\ln\left(x\right)}{e^x-4x-2}\right)$
$x^2+x-2<16$
$\int\sqrt{4-u^2}dx$
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