Question

how do i find dot-product and angle between v and w in this?
v=3i-j w=i+j

Answer 1

if v = ai + bj and w = ci + dj

then

v dot w = a*c + b*d

Answer 2

Angle between them = \[\cos^{-1} \frac{ d.product }{ |v|*|w| }\]

Answer 3

thanks, you where both very helpful. :)