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Question

A line makes angles c x comma beta comma r and deltawith the four diagonals of a cube, then c o s to the power of 2 end exponent alpha plus c o s to the power of 2 end exponent beta plus c o s to the power of 2 end exponent r plus c o s to the power of 2 end exponent delta equals

  1. 1    
  2. 4/3    
  3. 3/4    
  4. 4/5    

The correct answer is: 4/3



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