$\frac{1}{9x+18}$
$6y+12z-18xyz$
$\left(sin\:a-cos\:a\right)^{\left(2\right)}\:\left(sin\:a+cos\:a\right)^{\left(2\right)}$
$\left(5a-5\right)\left(2+2a\right)$
$11+6\ge19$
$x^2+17x=0$
$2a^3+b^2-5c\:-a^3-7b^2+3c$
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