Question

( a vector+ B vector) . (a vector- B vector)= 2A squared + AB cos theta- 6B squared
Prove this

Answer 1

There must be some given condition, I believe.

Answer 2

no that's it ;/

Answer 3

It's possible only when, cos theta = (5b^2 - a^2)/(ab)
where a and b are magnitudes.

Answer 4

can you please check the source once again ?

Answer 5

It's my term paper. Yeah it's all that's given

Answer 6

I may be sort of nagging.. but hey I thought I was good in vectors. Can you give the soft copy of your term paper or a snapshot ?

Answer 7

right now?

Answer 8

I mean , if you are willing then. It's upto you.