$5x-4>3x+2$
$\left(\:1-\cos\left(x^2\right)\right)\left(1+\cot\left(x^2\right)\right)$
$-36\cdot i^2$
$2x^3+5x^2-3x+3x^3+2x^2-5x$
$4\cdot3^2\cdot4$
$-13-8-7x$
$\frac{1-2x}{x+2}\le-2$
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