$\frac{cot^4x-9}{csc^2x+2}=csc^2x-4$
$\frac{1}{x}\ge2$
$\left(a+c\right)\cdot\left(7a+2c\right)$
$\int\frac{2x+1}{\left(x+1\right)\left(x+3\right)}dx$
$mx-m-x+1$
$-22+2-31+4-5-6$
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