$5x^2-12x+6$
$20x^4-45x^2$
$62.0+15.5$
$6\cos^2\left(x\right)+\cos\left(x\right)=1$
$h^2+6h+9$
$\frac{2}{\sqrt{b}+3}$
$1+\frac{1}{\tan\left(x\right)}$
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