$\sqrt[4]{81x^6}$
$f^2+6f+1$
$\cos\left(u\right)=-\cos\left(2u\right)$
$\lim_{x\to\pi}\left(\frac{\tan\left(x\right)}{x^3}\right)$
$x^3+2x\cdot4$
$x^2+4x+5=0$
$\frac{x^2+3x-10}{x+1}$
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