$\lim_{x\to2}cos\left(x\right)$
$3x^2-18x-15=0$
$\frac{4x^2+24x+6}{x^2+6x+9}$
$5x-7-3x+5$
$\int_1^46xdx$
$-5\left(3+x\right)-\left(x+1\right)>2x+3$
$18x^4+9xy^7$
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