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#1 2011-02-17 20:32:09
- Identity
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- Registered: 2007-04-18
- Posts: 934
An integral
It seems my brain has frozen over
Can anyone help me with this integral?
Thanks
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#2 2011-02-17 21:00:26
- Bob
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- Registered: 2010-06-20
- Posts: 10,621
Re: An integral
hi Identity,
I like to try to remove the horrible bit by substitution, so
that gives you:
That looks like a second substitution of
and I think that does it.
(I hope)
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
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#3 2011-02-17 21:07:48
- Identity
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- Registered: 2007-04-18
- Posts: 934
Re: An integral
Oh that seems to work, thanks bob :]
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#4 2011-02-17 21:13:44
- gAr
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- Registered: 2011-01-09
- Posts: 3,482
Re: An integral
Hi Identity,
or you may substitute x=sin(t)^2, then it reduces to:
and the final answer:
"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?
"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."
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#5 2011-02-17 21:18:27
- Bob
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- Registered: 2010-06-20
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Re: An integral
hi Identity,
You're welcome. Just checked it by differentiating my answer and, after removing all the algebraic bugs, it came back to the right thing. Phew! (took two pages!)
Good morning gAr. (At least, it's morning here in Essex!)
Bob
Last edited by Bob (2011-02-17 21:20:13)
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
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#6 2011-02-17 21:29:32
- gAr
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- Registered: 2011-01-09
- Posts: 3,482
Re: An integral
Hi,
Good morning bob.
It's 1459 here (India)
"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?
"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."
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