Question

if A= + j + k and B= - j - k, then angle between A and B will be nearly?

Answer 1

Answer:

A⃗ = J+k |A⃗ |=1+1−−−−√=2–√

B⃗ = -j-k. |B⃗ |=1+1−−−−√=2–√

Letθbe the angle between two vectors

A⃗ ⋅B⃗ =|A⃗ ||B⃗ |cosθ

⟹1(0)+(−1)(1)+0(1)=2cosθ

⟹cosθ=−1/2

⟹θ=cos^-1−1/2=120∘or240∘

I think this is the correct answer.

please mark it as brainliest.