$x^2-ax-1=0$
$n^2\:-\:8n\:+\:7$
$\left(12^2\right)^{-2}$
$dw=\ln\left(\frac{uv}{st}\right)$
$2x^2\cdot cos\left(8x\right)\cdot e^{\left(2x-2\right)}$
$2:3x-8<5x+5$
$\cot+1=0$
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