$\int\pi^{2}dx$
$\left(5a^2b^2-7\right)\left(5a^2b^2+8\right)$
$-4=2x-14$
$-3x^2y+y$
$2x^2+x;\:x=7$
$\left(1+co\theta\right)\left(1-cot\theta\right)$
$4a^2-15a+36$
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