$\int\left(\sec\left(6z\right)-\tan\left(6z\right)\right)^2dz$
$\int\left(x^2+1\right)x^2dx$
$\frac{t}{\frac{t}{t}}$
$y^2-6y+13$
$\frac{x^2}{16}-\frac{2}{40}x+\frac{1}{5}$
$5+\left(-11\right)-\left(-11\right)$
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