$81-72a+36a$
$3+20+-2$
$x^2-34x+289$
$c^2-c+1$
$6m^2+5am-4m^2$
$\lim_{x\to45}\left(\sin\left(45\right)\right)$
$2\csc2x=\csc^2x\cdot\tan x$
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