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ISI2015-MMA-45

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Angles between any pair of $4$ main diagonals of a cube are

  1. $\cos^{-1} 1/\sqrt{3}, \pi – \cos ^{-1} 1/\sqrt{3}$
  2. $\cos^{-1} 1/3, \pi – \cos ^{-1} 1/3$
  3. $\pi/2$
  4. none of the above
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