Is this part of the 2 unit course? (1 Viewer)

[MrBrightside]

Integral of xcos(x) dx ?

video: http://www.youtube.com/watch?v=Pra6r20geXU&feature=relmfu

 

[SpiralFlex]

Integral of xcos(x) dx ?

video: http://www.youtube.com/watch?v=Pra6r20geXU&feature=relmfu

No. This is done in 4 Unit.

 

[michaeljennings]

integration by parts! yeah baby

 

[MrBrightside]

No. This is done in 4 Unit.

farrkin thank God. phew almost had a heart attack.

 

[tambam]

integration by parts! yeah baby

Is this an integration by parts question?
I figured out how to do it, but i didn't realise that you could integrate them separately and then shove it back together....

 

[michaeljennings]

Is this an integration by parts question?
I figured out how to do it, but i didn't realise that you could integrate them separately and then shove it back together....

No this is a substitution question im fairly sure you get negative e to the power of inverse cos as your value you sub 1 and 0 into am i correct?

 

[nightweaver066]

No this is a substitution question im fairly sure you get negative e to the power of inverse cos as your value you sub 1 and 0 into am i correct?

Yes that's correct.

 

[michaeljennings]

Yes that's correct.

someone has to teach me how to write these things nicely like tambam idk how to do it

 

[SpiralFlex]

Is this an integration by parts question?
I figured out how to do it, but i didn't realise that you could integrate them separately and then shove it back together....

It can be easily integrated with substitution.

I will ignore the definite integral.

Let

 

[tambam]

No this is a substitution question im fairly sure you get negative e to the power of inverse cos as your value you sub 1 and 0 into am i correct?

Whattt? lies. it was in the 2010 ext1 paper, and it did not say 'use the substitution blablablah' which is what substitution questions in ext 1 are meant to be.

 

[michaeljennings]

Whattt? lies. it was in the 2010 ext1 paper, and it did not say 'use the substitution blablablah' which is what substitution questions in ext 1 are meant to be.

was that our school paper?

 

[tambam]

was that our school paper?

yeah, isn't ext1 integration by substitution meant to always give you the substitution?

 

[michaeljennings]

yeah, isn't ext1 integration by substitution meant to always give you the substitution?

yes it is hang on ill have a look at the paper