$\lim_{x\to+0}\left(\frac{1}{2x}-\frac{1}{sinx}\right)$
$-6^2-1$
$1.452323\:\:\frac{7189}{4950}$
$0.6931471805599453\:\cdot0.3620454462036935\:$
$\int\frac{5x^3+2x^2-40x-21}{x^2-9}dx$
$-a^2-2bc-\left|c\right|$
$a^2-a^2h^2$
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