$\lim_{x\to0}\left(\frac{tan^{-1}x}{x^2-x}\right)$
$log\left(2x-7\right)-log\left(x-1\right)=log5$
$\frac{b^2a^2-bab^2+b^2}{a}$
$3\cdot8-5^2$
$\csca\left(1-\cos^{2}a\right)=\sena$
$\left(4x-20\right)^3$
$2\cdot x-6=\sqrt{x^2-3x}$
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