$\arccos\left(0.7135\right)$
$60x+60=50x+90$
$\frac{x^{6}}{x^{6}}$
$25x^2+x-32x^2-7x$
$4a^2-20a+100$
$5x+2\le17$
$\lim_{x\to1}\left(\frac{e^{x-1}-1}{\frac{1}{e}-e^{-x}}\right)$
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