Solve (x^{3}-15 x-4=0) using the method for solving cubics. Now cleverly spot an integer root. Deduce that
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Solve \(x^{3}-15 x-4=0\) using the method for solving cubics.
Now cleverly spot an integer root. Deduce that
\[ \cos \left(\frac{1}{3} \tan ^{-1}\left(\frac{11}{2}\right)\right)=\frac{2}{\sqrt{5}} \]
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