You are Here: Home

# integration by parts Tweet

Maths and statistics discussion, revision, exam and homework help.

Announcements Posted on
Enter our travel-writing competition for the chance to win a Nikon 1 J3 camera 21-05-2013
IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
1. integration by parts
with limits 1/2 pi and zero

[-3/2cos2x+3/4sin2x] is what i end up as my integral then when i sub the limits i keep getting a three for my answer. Can't get it to latex properly to show my working, but does that integral seem correct?
2. Re: integration by parts
Looks right.
3. Re: integration by parts
(Original post by Brit_Miller)
Looks right.
am i just subbing in the limits wrong or something stupid like that; what do you get when you sub the limits into that?
4. Re: integration by parts
(Original post by Emissionspectra)
am i just subbing in the limits wrong or something stupid like that; what do you get when you sub the limits into that?
I'll write it out, it just looked right looking at it, I'd better check.
5. Re: integration by parts
(Original post by Emissionspectra)
with limits 1/2 pi and zero

[-3/2cos2x+3/4sin2x] is what i end up as my integral then when i sub the limits i keep getting a three for my answer. Can't get it to latex properly to show my working, but does that integral seem correct?
I think ur missing an x here. -(3/2)xcos(2x)
6. Re: integration by parts
(Original post by Emissionspectra)
with limits 1/2 pi and zero

[-3/2cos2x+3/4sin2x] is what i end up as my integral then when i sub the limits i keep getting a three for my answer. Can't get it to latex properly to show my working, but does that integral seem correct?
(Original post by Brit_Miller)
Looks right.
Mistake here.

It should be,
7. Re: integration by parts
(Original post by SilentIdea)
I think ur missing an x here.
Yep, just realised that when I wrote it out.
8. Re: integration by parts
(Original post by SilentIdea)
I think ur missing an x here. -(3/2)xcos(2x)
Ye i see it now urgh ah well got it correct now; thanks