Maths-
General
Easy

Question

If cos3A + cos3B + cos3C =1 then one of the angles of ΔABC is

  1. 60 to the power of ring operator end exponent    
  2. 90 to the power of ring operator end exponent    
  3. 120 to the power of ring operator end exponent    
  4. 135 to the power of ring operator end exponent    

The correct answer is: 120 to the power of ring operator end exponent

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