Here's the question you clicked on:
TransendentialPI
This exercise is in a section about using trig substitution to integrate. I can use trig sub, but I'm just not seeing what initial substitution to use so I can apply trig sub. Can anyone give me a hint? I don't need (don't want) it solve to the end. At least not yet.
see this http://en.wikipedia.org/wiki/Trigonometric_substitution
The trick is, how do we get this integral into the form\[dx \over \sqrt{u^2 +a^2}\]
sorry du on top
note, 16+x^6= (4)^2+(x^3)^2. or (x^3)^2+(4)^2.
what will be the a ? and what will be the u?
then, get the derivative of u.
Thanks, that is just what I needed.