$a+a^2+a$
$bc\:\cos\left(a\right)\:+\:ac\:\cos\left(b\right)\:=c^2$
$\left(3a^3\:+\:5ab\right)^2$
$6c-2d$
$3+7u+9$
$2-secx\cdot cscx$
$\frac{-x^4+20x^2-19x+12}{x-4}$
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