$cot^2tan^2$
$\int\:x+1\:.\:\sqrt{2-x}\:dx$
$\frac{-6x^2+5x+15}{11x^3-4x+7}$
$\int_{x^2}^2x\left(x-1\right)dx$
$\lim_{x\to2}\left(\frac{x^2+x+6}{x}\right)$
$16x^{2-32x}$
$8\:\ln x-\frac{1}{9}\ln y$
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