$\frac{x-3\left(x-9\right)}{x^2}$
$15+0.54$
$\frac{sec^2x}{tan\left(x\right)+cot\left(x\right)}$
$x^2-6^2+9$
$\left(3a+4b+7c\right)^2$
$\frac{2x^2+7x+11}{x+2}$
$3x^2-12x+4=0$
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