$\frac{\left(0.111+\frac{0.3}{0.363636}\right)}{1-0.2}$
$x+5<1$
$\frac { x ^ { 2 } } { 2 x ^ { 2 } - 2 x - 4 }$
$\left(5n\right)^2-5n^2$
$\frac{cotx}{\:cscx+1}=\frac{cscx-1}{cotx}$
$3\left(a^4+a^3+1\right)$
$\frac{cosx\:cscx}{tanx}$
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