$803.25+650.94+34.876$
$\frac{1}{\cos\left(x\right)-1}-\frac{1}{\cos\:\left(x\right)+1}$
$-2x+5\ge15$
$\left(a^7-a^3\right)^4$
$3y+6-y$
$\frac{20k^4}{12k^3}$
$x=2y+1$
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