$\left(+17\right)\:-\:\left(-12\right)$
$\int2a^{b^2}dx$
$7d+7d$
$\frac{\left(x+2\right)^2}{x^2-3}+\frac{x-3}{x+2}$
$\frac{1-\cos\left(x\right)}{\cos^2\left(x\right)}$
$\left|-8+10-5+6\right|-13$
$\left(-6a^2+3a+7\right)+\left(8a^2-7a+5\right)$
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