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$\large 8x^3-6x+1 = 0$

If $a$, $b$ and $c$ are the roots of the equation above, find the value of $\cos^{-1} a + \cos^{-1} b + \cos^{-1} c$ in degrees.

If you think that roots exist outside $[-1, 1]$, write 272 as your answer.

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