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We use FOIL to solve this: (First, Outer, Inner, Last)
First: r² times r² which gives us r^4
Outer: r² times -t² which gives us -r²t²
Inner: t² times r² which gives us r²t²
Last: t² times -t² which gives us -t^4
We combine like terms and see that the middle two terms (outer and inner) cancel out. We get
r^4 - t^4
Hope that helps.
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