$\left(-169\right)-\left(-13\right)$
$\left(\frac{a}{2}\right)+10=19$
$\lim_{x\to0}\left(\frac{x^3+x^2-x}{1-cos\left(3x^2\right)}\right)$
$\tan x\csc^2x-\tan x$
$4xy^2-3xy+8xy^2-2xy$
$5n^2-20n+6=0$
$\left(-6a^3-y^2\right)^2$
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