$-4-\:3y^2+y-2$
$2x^2\left(x^5-y\right)$
$8\cos x-3=1$
$\frac{x^4+2}{x^2+4x+1}$
$\frac{4x^3y^2}{3x^2}$
$\left(a^{-1}+b^{-1}\right)^2$
$\sec\left(x\right)=5$
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