$-3\:-\:\left(-4\right)\:\cdot\:\left[2\:\cdot\:\left(-6\right)\right]$
$2x-7<3x-9$
$\int_1^5\left(\frac{\sqrt{x-1}}{x}\right)dx$
$\left(x^4-4x^3+8x^2-11x+6\right)\left(x^2-x+3\right)$
$19\cdot23$
$x^2-1=99$
$\frac{dy}{dx}=\:cos2x-sex$
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