$\tan\left(x+\pi\right)$
$x^2y-zy$
$\int\csc\left(2x\right)\sec\left(2x\right)dx$
$x^{2\:}-11x\:+\:-2\:\frac{3}{4}$
$4\:sin\:\left(\frac{2}{3}x+\:\frac{\pi\:}{9}\right)$
$\int_0^{\infty}\left(t^2e^{-st}\right)dt$
$x^2\left(x^8+1\right)+x^6+\left(x^2-1\right)\left(x^4+x^2+1\right)$
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