$sin\left(\frac{x}{2}\right)=\frac{\sqrt{3}}{2}$
$1.20-18$
$\lim_{x\to2}\left(-16x^2+144\right)$
$5x^2-17-6$
$\left(9x+5y\right)+\left(3x+7y\right)$
$8\log x+\log y$
$9x^2-40x+54=6x^2-22x+27$
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