$\int\frac{x^{2}}{\left(yx^{3}+7\right)^{2}}dx$
$cscx-sin=\frac{1}{secxtanx}$
$7y+8y$
$n^{-1}\:\frac{18}{r^2}$
$-2\left(x^3-6x^2+4x-1\right)$
$\frac{\left(1+x\right)^2}{x+2}$
$\frac{n}{9}=\frac{25}{n}$
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