$\frac{c}{1}$
$60x\:=\:18x$
$a^2-b^2-\left(a-b\right)^2$
$\left|-7\right|-7$
$\sec\left(t\right)+\cot\left(t\right)$
$\frac{\left(x^2+2\right)}{\left(x^4-1\right)}$
$x-8x$
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