Answers created by George Plousos

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• Two towers of height 15m and 25m respectively stand on level ground. The angle of elevation of their tops from a point between the two towers on the line joining their feet are respectively 45° and 600 Find the distance between the two towers?
  
• What are the functions #f_1, f_2#? The values ​​of double signs are defined by the function #S(k)#.