How do you evaluate the definite integral $int dx/x$ from $[1,2]$ ?

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Answer 1 · 2016-10-22T14:09:48

$int_1^2(dx)/x=ln2$

As $d/(dx)lnx=1/x$

$int_1^2(dx)/x=int_1^2(dx)/x=[lnx]_1^2$

= $ln2-ln1=ln2-0=ln2$

How do you evaluate the definite integral int dx/xint dx/x from [1,2][1,2]?