Question

Find the integral of 4x/(1+4x^2) dx from 1 to infinity.

Answer 1

well it looks like a log function to me....

the numerator is 1/2 the derivative of the denominator...

hope that helps

Answer 2

So it's (1/2)*ln(1+4x^2) from 1 to infinity, right? Because I used the u-substitution with u=2x but it didn't work.

Answer 3

that seems to make sense...

Answer 4

Thank you!