$\frac{2}{3}x^2-\frac{1}{6}x^4$
$m^2n^2x^4-\:9m^2n^2$
$\sin\left(\pi+x\right)+\cos\left(\pi-x\right)$
$-2\left(-2\right)\left(+2\right)\:-\:\left(2\right)$
$\int\frac{2x^3+x^2+x-7}{x}dx$
$x^2-3x=28$
$x=1.4\left(\log c-\log d\right)$
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