$\left(5+6\right)^2-5^2+6^2$
$3\sin2x-\sin x-4$
$\lim_{z\to2}\left(\sqrt{7z^2+14z-7}\right)$
$x^2+18x+68=0$
$cos\:x+2cos\:2x$
$\lim_{y\to5}\left(\frac{y^2+y-30}{\sqrt{50-y^2-y}}\right)$
$\int\frac{4x-7}{\left(x-1\right)^2}dx$
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