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The roots of the equation 8x^(3)-4x^(2...

The roots of the equation
`8x^(3)-4x^(2)-4x+1=0 " are " cos""pi/7, cos""(3pi)/7 " and " cos""(5pi)/7`.
Evaluate `sec""pi/7+sec""(3pi)/7+sec""(5pi)/7`

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