$\frac{d^2}{dx^2}\left(x^4-5x^2+6\right)$
$\left(3\right)^{\left(-2x+4\right)}$
$\frac{e^{xdy}}{dx}=2x$
$\frac{2+3v}{1+3v+2v^2}$
$-16\left(-8\right)+\left(-7\right)+\left(-20\right)$
$169x^2+260xy+9x$
$-15a^2-24a^2$
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