$a+a+2a+2a$
$\frac{t^{20}}{t^5r^3}$
$9z^4+42z^2+49$
$7+4-9+6-11.2+8-5+10+2$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{sin\left(24x\right)}\right)$
$185+-638$
$y'=\frac{x^2}{y^3}$
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