$6z^2+z-2$
$\left(13x^3-9y^5\right)\left(13x^3+9y^5\right)$
$-50x^7m+25x^3m+75x^6m$
$secy\left(1+cot^2y\right)$
$-6\left(12\right)$
$2\:cos^2\theta\:\:-\:sin\theta\:\:-1\:=0$
$1-3+2+6$
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