$\frac{x^2-81}{x+9}$
$\int\:4\:cos\:\frac{x}{3}dx$
$5x^2<20$
$\left(a+7\right)^2=a^2+y\:a+49$
$\sqrt{-6}\sqrt{-96}$
$\frac{\left(x-1\right)}{\left(x^2-2x\right)}$
$\frac{x^3-3x^2+4x-5}{x+2}$
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