$t^2+11t$
$8b-4b-6$
$\frac{cos\theta\:\:sec\theta\:}{cot\theta\:}=tan\theta\:$
$9cos\left(x\right)+9sin\left(x\right)tan\left(x\right)=9sec\left(x\right)$
$225x^2-30x+1$
$3n^3-n^2$
$\lim_{x\to3}\left(2\right)$
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