$\frac{d^2}{dx^2}\left(\frac{\left(3x-2\right)}{\left(2x+3\right)}\right)$
$z^2-15z+2$
$5a+2b+3a+4$
$x^2+2x+\left(\frac{b}{2}\right)^2$
$x^2+12x+19=0$
$\int-\left(cot^2x+cotx+1\right)csc^2xdx$
$2x^4-2x^3+6x^2$
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