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July 7, 2015

Homework Help: math

Posted by Yuni on Sunday, December 25, 2011 at 4:59am.

if a & b are perpendicular vectors, show that
a)(a+2b).(a-b)=|a|^2-2|b|^2
b)(a+b).(a-b)=|a|^2+|b|^2

*how to show it?just multiply it?if yes where does||come from?
does||show that it should be a value?

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