$\left(x-\frac{3}{4}\right)\left(x+\frac{3}{4}\right)$
$\frac{\left(5x^2-\frac{13}{18}xy-\frac{2}{3}y^2\right)}{\left(3x-\frac{4}{3}y\right)}$
$\frac{d^2}{dx^2}\left(3x^2\sin\left(2x\right)\right)$
$\frac{10}{00}$
$4x^{-1}$
$-\frac{x}{x^2+4}\ge3$
$-3a^2-a^2$
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