Show that A.(B+C)=A.B+A.C using anything but the coordinate definition of the dot product.
Any ideas?
Thanks
I tried to use that, but couldn't. I know I need to show that
|A||B+C|cos(theta)=|A||B|cos(a1)+|A||C|cos(a2)
but I can't come up with any relationships between the angles (or anything else for that matter).