$\sqrt{x}\left(8-x^6\right)$
$sinx-sin3x$
$\frac{dy}{dx}=\frac{x^3}{1-3x^4}$
$\lim_{x\to\infty}\left(\frac{\sqrt{10x^4+x^2+20}}{15x^9+33}\right)$
$\sin\left(x-\pi\right)=-\sin\left(\pi\right)$
$\left(5mn+3m^2n\right)^3$
$x^2-9x+4<0$
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