Turn on thread page Beta
 You are Here: Home >< Maths

# C4 integration help... watch

1. how would integrate this ...

∫ 2 sin 3x sin 2x dx.
2. (Original post by Raysfc16)
how would integrate this ...

∫ 2 sin 3x sin 2x dx.
Use trigonometry to change the form of the integrand.
Spoiler:
Show
Hint:
Expand
3. (Original post by Raysfc16)
how would integrate this ...

∫ 2 sin 3x sin 2x dx.
Use your formula booklet. Under the C3 section, it clearly states that .

Use this in the case that and , so and .

This gives you
4. Oh, and moved to maths.
5. (Original post by EricPiphany)
Use trigonometry to change the form of the integrand.
Spoiler:
Show
Hint:
Expand
(Original post by Zacken)
Use your formula booklet. Under the C3 section, it clearly states that .

Use this in the case that and , so and .

This gives you

thank you so much guys!
6. (Original post by Raysfc16)
thank you so much guys!
Pleasure.
7. It can also be done by parts
8. (Original post by TeeEm)
It can also be done by parts
Twice? I'm going to try it
9. (Original post by EricPiphany)
Twice? I'm going to try it
Indeed
Just as quick but not widely known
10. (Original post by EricPiphany)
Twice? I'm going to try it
Cyclic IBP's, the kind where you need to re-arrange and solve for . It's not as quick as spotting the trig simplification, though.
11. (Original post by TeeEm)
Indeed
Just as quick but not widely known
Just as quick?

Reply
Submit reply
Turn on thread page Beta

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 9, 2016
Today on TSR

### He lied about his age

Thought he was 19... really he's 14

### University open days

1. University of Bradford
University-wide Postgraduate
Wed, 25 Jul '18
2. University of Buckingham
Psychology Taster Tutorial Undergraduate
Wed, 25 Jul '18
3. Bournemouth University
Clearing Campus Visit Undergraduate
Wed, 1 Aug '18
Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.