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OpenStudy (anonymous):
r^3-t^3/r^2-t^2
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OpenStudy (anonymous):
r^3 -t^3 = (r-t) (r^2 +rt +t^2) r^2 -t^2 =(r-t) (r^2 +rt +t^2) r^3-t^3/r^2-t^2 = [(r-t) (r^2 +rt +t^2)]/ [(r-t) (r^2 +rt +t^2)] Cancel (r-t) r^3-t^3/r^2-t^2 = ( r^2 +rt +t^2) / (r +t)
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