Questions asked by Jack H.

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• How do you factor #(a+b+c)(ab+bc+ca)-abc#?
  
• When those conditions are given in the diagram, What is the value of #sinx#? ABCD is a square.
  
• How do you find x when line AB, CD, and AD are tangent of circle O? (Point O is the centre of the circle, line BO and OC are radius of circle O.)[**NOT DRAWN ACCURATELY**]
  
• How do you find the radius of small circle?
  
• How do you solve this question? When #1<=x<=8# and #log_2(y)=[log_2(x)]^2# is given, What is maximum and minimum value of #x^2/y#?