(x-y)(x+y) (x^2+y^2) (x^4+y^4)
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The trick to this problem is to know what to multiply first.
Difference if square rule states: `(x-y)(x+y)=(x^2-y^2)`
Keeping that in mind, we will work from left to right in order to apply this rule few times without having to do a lot of work.
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