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(1)/(1+e^(-x))...

`(1)/(1+e^(-x))`

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`int(1)/(1+e^(-x))dx=int(1)/(1+(1)/(e^(x)))dx`
`int (e^(x))/(e^(x)+1)dx=int ((d)/(dx)(ex+1))/(e^(x)+1)dx`
`=log |e^(x)+1|+c" "....[therefore int(f'(x))/(f(x))dx=log|f(x)|+c]`
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