$\frac{3-3\cos\left(x\right)}{5\sin\left(x\right)}$
$x^{-2}-\frac{3}{x^2}$
$\frac{n}{-2}>4$
$1+2\cdot5$
$\left(a+x\right)\left(b+x\right)\left(c+x\right)\left(d+x\right)$
$\frac{3x^3+8x^2-2}{3x+x^2-1}$
$\frac{dy}{dx}=xy-x-2y-2$
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