$4x^2-4x-2$
$y\frac{dy}{dx}=x\left(y^2+1\right)$
$\frac{10x^3-5x^2+3x-5}{x-1}$
$5.\left(x+2\right)+3\le2x+7$
$21\:+\:7\:\left[5\:-\:\left(4\:-\:1\right)\:-10\:\right]$
$\lim_{x\to\frac{\pi}{4}}\left(9\left(tanx\right)^{tan\left(2x\right)}\right)$
$12x^2\:-\:8xy\:-\:15y^2$
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