# Math Help - integration part 2

1. ## integration part 2

$
\int (xsinx^2cosx^2),dx

$

2. Start by makin' $u=x^2.$

3. ## integration part 2

ok not quite getting it. can you help me out a little more please.

4. $u=x^2\implies du=2x\,dx,$

$\int {x\sin x^2 \cos x^2 \,dx} = \frac{1}
{2}\int {\sin u\cos u\,du} = \frac{1}
{4}\int {\sin 2u\,du} .$

5. ## needing a little more help w/ this....

$

(x)tan^{-1}(x)-\frac{1}{2}ln({x^2}+1)+C
$

and i'm not sure how i would get that using

$
{1/4} \int sin2u

$

6. Originally Posted by simsima_1

$

(x)tan^{-1}(x)-\frac{1}{2}ln({x^2}+1)+C
$

and i'm not sure how i would get that using

$
{1/4} \int sin2u

$
there are often many different forms for the answer to an integral. following Krizalid's suggestion is good enough.