$2y-y+7-1+3+7x^2-4y$
$\frac{625-x\:^4}{5+x}$
$\int\frac{4x^2+x-2}{\left(x^2+1\right)\left(x^2+9\right)}dx$
$\int\:3x^{-6}dx$
$-4=\csc\left(\theta\right)$
$2\cdot3^x+9=63$
$\frac{a+b}{a^2-b^2}\cdot\frac{a^2-2ab+b^2}{a^2-ab}$
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