$\lim x\to0\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$8a^2-11a^3+20a^2-a^2+7a^3$
$10-\left(-9\right)^2$
$\int\left(x^2+1\right)\ln2xdx$
$\lim_{x\to1}\left(\frac{x^3+2\:x^2-3x}{x^2-1}\right)$
$\int\sin^2\left(\frac{x}{5}\right)dx$
$3x^2+2x+7+5x+4$
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