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`int_e^(e^4)(dx)/(x sqrt(lnx))=|(t=lnx),(dt=(dx)/x),(t_1=ln e=1),(t_2=ln e^4=4)|=`
We have made substitution which means we also need to change limits of our integral to `t_1` and `t_2`.
`int_1^4(dt)/(sqrt t)=2sqrt t |_1^4=2sqrt4-2sqrt1=2cdot2-2cdot1=2`
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