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Here is an example to illustrate the problem. 
  
 > y := SQRT(4);
                                   y := SQRT(4)
To get the square root function, you must use the name "sqrt", because Maple is case sensitive. Other examples of this are:
  • use "Pi" rather than "pi" to get 3.141etc
  • use "exp(1)" rather than "e" to get 2.718etc
  • use "I" rather than "i" to get the square root of minus 1
Also note that, for example, "Int" and "int" are both Maple commands, but work differently.
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