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`?