$3x^2-7x-3=0$
$2\left(r+6\right)$
$b^2-2b-3$
$x^2-\frac{4x}{3}+\frac{2}{3}$
$x^2+2x\le0$
$\frac{d^2}{dx^2}\left(x^2+y^2=3\right)$
$cot^2a\:\:\:tan\:a$
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