$2x^2-\frac{4}{9}y^2$
$6x^2y-1x^2y+5x^2y$
$x^2-10=-20$
$\lim_{x\to0}\left(\frac{5-5cosx}{cos3x}\right)$
$\frac{d}{dx}x^2y=5$
$\frac{x^6+5x^4+3x^2-2}{x^2-x+3}$
$\left(-d-2x\right)^5$
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