Question

Integrate help please!

Answer 1

\[\Huge \int\limits \sqrt{(x^2+4)} (x^2+1)\]
I thought of letting x=1/t but no luck

Answer 2

Hmm yah I can't seem to find a good substitution.
Seems like you might just want to expand out the brackets:\[\Large \int\limits x^2\sqrt{x^2+4}\;dx+\int\limits (1)\sqrt{x^2+4}\;dx\]

Answer 3

Second integral would involve a trig sub.
First one would be ummmm, integration by parts.

Answer 4

Lets talk about 2nd one
how about 2tanx?

Answer 5

Yah that seems like a good sub :)

Answer 6

and in the 1st one..
the first function should be x^2?

Answer 7

Hmmm I think this works...