$8a^4+0a^3-6a^2+0a-9$
$in\:x^2\:-\:2\:in\:y\:$
$9x^4+6x^3+x^2$
$\lim_{x\to1}\left(\frac{x^2+2x-3}{\sqrt{2-x^2}-x}\right)$
$\lim_{x\to\frac{\pi}{2}}\left(1+2cosx\right)^{secx}$
$-3\left(3d-7\right)-2d$
$\int\left(x-3\right)^{10}\cdot\left(2x-1\right)dx$
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