$12\cdot4.3\cdot5$
$9-4+2-5-8+2-4-7$
$2\cos^2x-\cos2x-1=0$
$f^2+17f+72$
$\int_{1.5}^3\left(\frac{1}{4-3x}\right)dx$
$-8-w>-7$
$\lim_{x\to11}\left(\frac{x^2-121}{77-4x-x^2}\right)$
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