Badiuddin askIITians.ismu Expert
Last Activity: 15 Years ago
Dear kshitij
you can find the solution of these type of integral in terms of infinite series
I=∫(1/lnx)dx
let lnx =t
or x= et
dx =etdt
I =∫(1/t) etdt
=∫(1/t)[1+t+t2/2! + t3/3! +..........]dt
=∫[1/t +1+t/2! + t2/3! +..........]dt
=lnt + t + t2/2*2! + t3/3* 3! +.........
=ln(lnx) + lnx + (lnx)2/2*2! + (lnx)3/3* 3! +.........
=ln(lnx) + ∑(lnx)r/r*r! where r varies from 1 to infinity
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