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Question Number 44921 by manish09@gmail.com last updated on 06/Oct/18

∫(1/(1+ln x))=?

$$\int\frac{\mathrm{1}}{\mathrm{1}+\mathrm{ln}\:\mathrm{x}}=? \\ $$

Commented by MJS last updated on 06/Oct/18

see question 44674

$$\mathrm{see}\:\mathrm{question}\:\mathrm{44674} \\ $$

Answered by tanmay.chaudhury50@gmail.com last updated on 06/Oct/18

t=1+lnx x=e^(t−1) dx=e^(t−1) dt ∫((e^(t−1) dt)/t) (1/e)∫((1+t+(t^2 /(2!))+(t^3 /(3!))+(t^4 /(4!))+...)/t)dt (1/e)∫(1/t)+(1/1)+(t/(2!))+(t^2 /(3!))+(t^3 /(4!))+... dt (1/e)(lnt+t+(t^2 /(2×2!))+(t^3 /(3×3!))+(t^4 /(4×4!))+...)+c (1/e){ln(1+lnx)+(1+lnx)+(((1+lnx)^2 )/(2×2!))+(((1+lnx)^3 )/(3×3!))+..}+c

$${t}=\mathrm{1}+{lnx}\:\:\:{x}={e}^{{t}−\mathrm{1}} \:\:\:\:{dx}={e}^{{t}−\mathrm{1}} {dt} \\ $$$$\int\frac{{e}^{{t}−\mathrm{1}} {dt}}{{t}} \\ $$$$\frac{\mathrm{1}}{{e}}\int\frac{\mathrm{1}+{t}+\frac{{t}^{\mathrm{2}} }{\mathrm{2}!}+\frac{{t}^{\mathrm{3}} }{\mathrm{3}!}+\frac{{t}^{\mathrm{4}} }{\mathrm{4}!}+...}{{t}}{dt} \\ $$$$\frac{\mathrm{1}}{{e}}\int\frac{\mathrm{1}}{{t}}+\frac{\mathrm{1}}{\mathrm{1}}+\frac{{t}}{\mathrm{2}!}+\frac{{t}^{\mathrm{2}} }{\mathrm{3}!}+\frac{{t}^{\mathrm{3}} }{\mathrm{4}!}+...\:\:\:{dt} \\ $$$$\frac{\mathrm{1}}{{e}}\left({lnt}+{t}+\frac{{t}^{\mathrm{2}} }{\mathrm{2}×\mathrm{2}!}+\frac{{t}^{\mathrm{3}} }{\mathrm{3}×\mathrm{3}!}+\frac{{t}^{\mathrm{4}} }{\mathrm{4}×\mathrm{4}!}+...\right)+{c} \\ $$$$\frac{\mathrm{1}}{{e}}\left\{{ln}\left(\mathrm{1}+{lnx}\right)+\left(\mathrm{1}+{lnx}\right)+\frac{\left(\mathrm{1}+{lnx}\right)^{\mathrm{2}} }{\mathrm{2}×\mathrm{2}!}+\frac{\left(\mathrm{1}+{lnx}\right)^{\mathrm{3}} }{\mathrm{3}×\mathrm{3}!}+..\right\}+{c} \\ $$

Commented by arvinddayama01@gmail.com last updated on 07/Oct/18

Thanks

$$\mathrm{Thanks} \\ $$

Commented by manish09@gmail.com last updated on 07/Oct/18

thanx sir

$$\mathrm{thanx}\:\:\:\mathrm{sir} \\ $$

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