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# Integration by parts help Watch

1. I know the Q could be done very easily, but I've just made it longer for myself. Nevertheless, I should've obtained the same answer. Having checked, I have no idea where I've made my mistake. I'm not sure if I "broke" a mathematical rule?

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2. (Original post by ps1265A)
I know the Q could be done very easily, but I've just made it longer for myself. Nevertheless, I should've obtained the same answer. Having checked, I have no idea where I've made my mistake. I'm not sure if I "broke" a mathematical rule?

Posted from TSR Mobile
not many people will be prepared to look at three pages of algebra (particularly of poor photo quality), however

I did look at the question which I am going to steal it as it is very good (for this I thank you)
Your plan is not that great.
Go back at the very start.

look at 2sec2xtanx

doesn't it look preety?
why is there a 2 there?

that might give a clue for your parts ...
the whole solution is half a page of A4
3. (Original post by TeeEm)
not many people will be prepared to look at three pages of algebra (particularly of poor photo quality), however

I did look at the question which I am going to steal it as it is very good (for this I thank you)
Your plan is not that great.
Go back at the very start.

look at 2sec2xtanx

doesn't it look preety?
why is there a 2 there?

that might give a clue for your parts ...
the whole solution is half a page of A4
What's the actual question. Can't see it clearly. Want to give it a try
4. (Original post by Super199)
What's the actual question. Can't see it clearly. Want to give it a try
I think it is 2x2 sec2xtanx
5. (Original post by TeeEm)
not many people will be prepared to look at three pages of algebra (particularly of poor photo quality), however

I did look at the question which I am going to steal it as it is very good (for this I thank you)
Your plan is not that great.
Go back at the very start.

look at 2sec2xtanx

doesn't it look preety?
why is there a 2 there?

that might give a clue for your parts ...
the whole solution is half a page of A4
Ah, got it! Thankssss!

Posted from TSR Mobile
6. (Original post by ps1265A)
Ah, got it! Thankssss!

Posted from TSR Mobile
Excellent!

I hope you saw what you meant to see ...

the "heavyweights" see d/dx(tan2x)= 2sec2xtanx

but the super-heavyweights see that little bit extra

how far did you see?
(Rhetorical Question)

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