Question

can someone help me answer this antiderivative question? http://puu.sh/8coHH.png

Answer 1

\[ \int \frac{1}{1+x} \ dx \]
let u= 1+x

note that du = d(1+x) = dx

so you can write the integral as
\[ \int \frac{1}{u} du \]
can you integrate that ?