i dont know wat to substitute for this integral
$\displaystyle
\int \sqrt{1 + 4x^2} dx
$
pls help me
yes thank you . I managed to solve it using x = 1/2 sinh t.
The book that im using is pretty old... so it doesn't show hyperbolic subsitutions..it only gives me trig substitutions for these problems.
I've come to realise that hyperbolic substitutions are much faster and easier in these situations...