$\lim_{x\to3}\left(\frac{x^2-x-6}{x^2+9}\right)$
$\sin\left(x\right)+\cos\left(x\right)\cos\left(x\right)$
$-2.31\left(-5.9\right)$
$\sqrt[m]{-1.331=-1.1}$
$18x+16=18x+16$
$\left(x^2-2\right)\left(x^2+3x+5\right)$
$-7\cdot\left(7+9\right)$
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