pls can anybody help me with a book link or material that treat this sort of problem above, am having challenges with it.

thanks.

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- December 21st 2013, 07:43 AMlawochekelriemann stieltjes integral!

pls can anybody help me with a book link or material that treat this sort of problem above, am having challenges with it.

thanks. - December 21st 2013, 12:12 PMromsekRe: riemann stieltjes integral!
there's no particular trick to this. You just need to observe where within the limits of integration |cos2x| changes sign and account for it.

on [0,pi/4], [3pi/4, 5pi/4]

on [pi/4, 3pi/4], [5pi/4, 6pi/4]

so split the integral up into these pieces using as appropriate. - December 21st 2013, 03:57 PMPlatoRe: riemann stieltjes integral!
This is a nasty problem. Look at this webpage.

On your question, I would do the*integration by parts formula*first.

Then use the*derivative formula*(just above that) on the new integral. - December 22nd 2013, 01:56 AMromsekRe: riemann stieltjes integral!
my apologies. I assumed your formula was just mangled like so many here. Ignore my last post.

- January 7th 2014, 12:09 AMlawochekelRe: riemann stieltjes integral!
thanks guys.