r²(s-t)+s²(t-r)+t²(r-s)=?
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Step-by-step explanation:
r²(s-t)+s²(t-r)+t²(r-s)
=r²s-r²t+s²t-rs²+rt²-st²
=r²s-r²t-rs²+rt²-st²+s²t
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