$\left(3r-s\right)^2$
$2x^2-14x+1=0$
$\frac{2^{28}}{2^4}$
$0.2n+0.6=2$
$2x-7>1$
$1-\csc^2\left(x\right)=\frac{1}{\cos^2\left(x\right)}$
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