$y=x^{-2}+x^{-1}$
$\left(-5\right)^2.\:\left(2-\left(-3\right)^2\:\right).\:4$
$\left(\frac{3}{7}a-\frac{2}{5}\right)\left(\frac{4}{9}a-\frac{3}{7}\right)$
$3\left(5cscx-7\right)=9$
$\int_0^3\left(\frac{5}{1+x^2}\right)dx$
$-3x^2+25x-6$
$1x^2+13x+14$
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