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# C4 - How would you integrate this?

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1. ∫ 2 sin 3x sin 2x dx.

Multiple methods pls and the simplest way
thanks !
2. Can be done by parts or use of factor formulae. ie. .
3. This was the markscheme way of doing it: = ∫ (cos x − cos 5x) dx
idk how they went from the original integral to this....
4. Look at my post above

This was the markscheme way of doing it: = ∫ (cos x − cos 5x) dx
idk how they went from the original integral to this....
5. (Original post by B_9710)
Can be done by parts or use of factor formulae. ie. .
Ah... why have I never seen this formulae before :/
6. (Original post by B_9710)
Look at my post above
Is the formula given (Edexcel) or do I have to memorise that *cries* or can I derive it in an exam?
Is the formula given (Edexcel) or do I have to memorise that *cries* or can I derive it in an exam?
You can derive it but it's easier just to remember it. There's 4 factor formula's you need to know although apparently it's not tested the factor formulae. But best to know I think.
8. (Original post by B_9710)
You can derive it but it's easier just to remember it. There's 4 factor formula's you need to know although apparently it's not tested the factor formulae. But best to know I think.
Ah they're given in the formula book yesss, thanks a bunch dude would never have known about them :/ kinda scary

9. I got it using a triple angle formula, a double angle formula then a substitution. It should be pretty simple from here
∫ 2 sin 3x sin 2x dx.

Multiple methods pls and the simplest way
thanks !
Just to add, have a look at your formula booklet (online). For Edexcel I suspect that it is in C3.

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