$3^2-1$
$\sqrt{3x^2y^5}$
$\frac{2x+21}{2x^2+9-5}$
$\int\left(5\right)^{-5}dx$
$\left(2a+1a^3\right)$
$2\cdot3^3+10$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{1}{cos\left(x\right)}-\frac{1}{\frac{\pi}{2}-x}\right)$
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