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OpenStudy (anonymous):
3u/u^2-1 + u/u-1, simplify
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OpenStudy (anonymous):
3u/(u-1)(u+1) + u/u-1=3u/(u-1)(u+1) +u(u+1)/(u-1)(u+1)=3u+u^2+u/u^2-1=u^2+4u/u^2-1
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