$\left(x^n+y^{3n}+z^m\right)^2$
$\sqrt{-8}$
$-6\cdot a;\:a=-4$
$\frac{4a^4b^{-3}}{ba^{-3}}$
$\frac{t}{1+t^5}$
$2y+1>0$
$\lim_{x\to1}\left(\frac{4x^2-3x}{x^3}\right)$
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