$x+2-x$
$\sin\left(\csc\left(x\right)+\sin x\sec^2\left(x\right)\right)=\sec^2x$
$\left(2y^2-7\right)^2$
$\sqrt{6}4^{-1}.4$
$\lim_{x\to0}\left(\frac{\sqrt{x^2-4}}{x-2}\right)$
$f\left(r\right)=\sqrt{rx}$
$\int\frac{\left(6\right)}{x^2-8x+4}dx$
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