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 Description  
 Equivalent Expressions:  Expressions that simplify to an equal value when numbers are substituted for the variables of the expression.
For example, (a+b)2 and a2 + 2ab + b2 are equivalent since whatever the numbers you substitute for a and b, you can always get the same value for both expressions. For example take a = 1 and b = 2, then (1 + 2)2 = 9 = 12 + 2*1*2 + 22.