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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,153

hi Graham,

then

so

The twist.

The middle term here is 'I' back again ! So

So

so

then

As I recall you wanted 2I so all that remains is to sub in the limits.

Check

QED.

Bob

*Last edited by bob bundy (2011-02-11 08:21:14)*

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

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**soroban****Member**- Registered: 2007-03-09
- Posts: 452

. .

. .

.

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,153

hi soroban,

Thanks for the method.

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

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