$\log\:_{\sqrt{5}}\:10\cdot\:\:log\sqrt{5}$
$x^4-4$
$\lim_{x\to0}\left(\frac{1-\cos\left(2x\right)}{\tan\left(4x\right)\cdot\tan\left(2x\right)}\right)$
$sin\left(\frac{\pi}{12}\right)=x$
$y=\frac{2}{x}-\frac{1}{x^{2}}$
$m^2-26m+169$
$y^2-15y+54$
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