$\frac{x^2+12}{x^2+4}$
$\left(6x^4\right)+\left(-8x^4\right)$
$2.375sin\left(\frac{\pi}{6}\left(1\right)-\frac{\pi}{2}\right)+12.125$
$\left(3y+x\right)\left(27xy^3\right)$
$-9\left(x-1\right)$
$\frac{9-x^2}{-\sqrt{3x^2-2}+5}$
$-5-6-2-\left(-8+9-4-7+8\right)-6+9-5$
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