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Multiple choice

$\cos \dfrac{2\pi}{7}, \cos \dfrac{4\pi}{7}, \cos \dfrac{6\pi}{7}$ are roots of equation

  1. $8x^3+4x^2-4x-1=0$
  2. $8x^3+4x^2-4x+1=0$
  3. $8x^3-4x^2-4x+1=0$
  4. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer

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  • Algebra (3715 questions)
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