Question
Expand:$\left(2 x-\frac{1}{x}\right)^6$
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$
\lim _{x \rightarrow \frac{x}{4}}\left[\frac{\cos x-\sin x}{\cos 2 x}\right]
$
$\left|\begin{array}{ccc}b+c & b c & b^2 c^2 \\ c+a & c a & c^2 a^2 \\ a+b & a b & a^2 b^2\end{array}\right|=0$