$\frac{1}{2}\cdot\sin\left(x\right)+1-\cos^2\left(x\right)=0$
$\int\frac{1}{x\:\sqrt{4-x^2}}dx$
$4x+25=57$
$x^2+36x+18$
$x+7<5-2x$
$\lim_{x\to0}\left(2x\left(\frac{7}{x}\right)\right)$
$\lim_{x\to2}\left(\frac{x^2+x-6}{x^2-2}\right)$
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