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2005 Paper 2 Q10

Adam

Posted 04 May 2006 - 07:22 PM

Can somebody explain how this is done? smile.gif

Cheers

Nathan

Posted 04 May 2006 - 09:19 PM

you need to work out a.a (which is just a[^2]

then a.b=|a||b|cosx, where x=60 (equilateral triangle)

and finally a.c= |a||c|cosx, where x=90 (perpendicular)

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