Question

integrate 8xsinx...
I am forgetting something simple here and need a push...i'm leaning towards Int. by Parts?

Anyone help? Thanks!

Answer 1

Yah looks like parts! c:
We want the \(\large x\) to be our \(\large u\) so it will decrease in degree as we do our parts.

Answer 2

lolol your user name is hilarious c:

Answer 3

ok..lemme think about that...so it will decrease in degree...hmmm

Answer 4

Thanks! :o)

Answer 5

so if x = u, then du=dx

Answer 6

yah looks good

Answer 7

See how the x decreased from x^1 to x^0 (which is just 1)?

Answer 8

yeah, I see that decrease in degree...never thought of it like that.one sec...lemme do some scratch work...brb

Answer 9

Now I do parts?

Answer 10

Ah my bad :( I didn't mean a `U substitution`. I meant `Integration by parts. Letting \(\large u=x\) and \(\large dv=\sin x \;dx\)

Answer 11

oh!>>>HAHA>>>yeah that was scaring me for a minute! yikes...lemme redo then

Answer 12

XD

Answer 13

alternative :
USE THE TABLE INTEGRAL :)