1.

What is `int (dx)/(x l nx)` equal to ?A. `l n (ln x) + c`B. `l n x + c`C. `(l nx)^(2) + c`D. None of the above

Answer» Correct Answer - A
Let `I = int (dx)/(x l nx)`
Put `l n x = t rArr (1)/(x) = dt`
`:. I = int (1)/(t) dt = l n t + c = l n (l nx) + c`
where c is the constant of integration


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