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Question

Show that
1u01u1+1u21u3++(1)n1un=1u0+u20u1u0+u21u2u1+u2n1unun1.

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Solution

Put,
1ur1ur+1=1ur+xr
(ur+1ur)(ur+xr)=urur+1;
So that xr=u2rur+1ur and
1u01u1=1u0+u20u1u0;
1u01u1+1u2=1u0+u20u1u0+u21u2u1+
and so on
Sum =1u0+u20u1u0+u21u2u1+........

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