$3x^2-3x<2x^2-4$
$64\cdot22$
$\left(7n-2\right)\left(3n-4\right)$
$xm-ym+xn-yn$
$\lim_{x\to1}4x^2$
$-\frac{cos2x\:}{sinx\:}=2sinx\:-cscx\:$
$3\cdot x^2\cdot1$
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