$\int6x^2\sqrt{x+9}dx$
$\int\sqrt{1-a^2x^2}dx$
$\lim_{x\to2}\left(\sqrt{3x^2+4}-4\right)$
$9y+3-4x-2y-3x-3$
$n^2-15n+50$
$2x-1<3x+8$
$\frac{sin\left(2x\right)}{2sin\left(x\right)}-\frac{cos\left(2x\right)}{2cos\left(x\right)}=\frac{sec\left(x\right)}{2}$
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