$20+90+51\left|5\right|$
$\frac{3}{\pi}x^2-\frac{2}{\pi}x$
$39^2$
$-\:9t^2+5t-4t$
$\sqrt{245}$
$9v+5v$
$\int\frac{6x}{\left(x^2+1\right)}dx$
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