can someone give step by step. Thanks!
Assuming expansion about x = 1:
Start with the geometric series:
1/(1 - t) = Σ(n = 0 to ∞) t^n.
Let t = x - 1:
-1/x = Σ(n = 0 to ∞) (x - 1)^n.
==> 1/x = -Σ(n = 0 to ∞) (x - 1)^n.
Integrate both sides from 1 to x:
ln x = -Σ(n = 0 to ∞) (x - 1)^(n+1)/(n+1).
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Divide both sides by x - 1:
ln(x)/(x - 1) = -Σ(n = 0 to ∞) (x - 1)^n/(n+1).
Integrate both sides:
∫ ln x dx/(x - 1) = C - Σ(n = 0 to ∞) (x - 1)^(n+1)/(n+1)^2.
I hope this helps!
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Verified answer
Assuming expansion about x = 1:
Start with the geometric series:
1/(1 - t) = Σ(n = 0 to ∞) t^n.
Let t = x - 1:
-1/x = Σ(n = 0 to ∞) (x - 1)^n.
==> 1/x = -Σ(n = 0 to ∞) (x - 1)^n.
Integrate both sides from 1 to x:
ln x = -Σ(n = 0 to ∞) (x - 1)^(n+1)/(n+1).
-----------
Divide both sides by x - 1:
ln(x)/(x - 1) = -Σ(n = 0 to ∞) (x - 1)^n/(n+1).
Integrate both sides:
∫ ln x dx/(x - 1) = C - Σ(n = 0 to ∞) (x - 1)^(n+1)/(n+1)^2.
I hope this helps!