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Use the structure of an expression to identify ways to rewrite it. For example, see $x^4 - y^4$ as $(x^2)^2 - (y^2)^2$, thus recognizing it as a difference of squares that can be factored as $(x^2 - y^2)(x^2 + y^2)$.


Seeing Dots
Equivalent Expressions
Sum of Even and Odd
Animal Populations
Computations with Complex Numbers
A Cubic Identity