Question

Plz answer the question very urgent



The angle between vectors (i^ +J^ ) and (j^ + k^) is


​

Answer 1

A * B = ( i^ + j^ ) ( j^ + k^ ) cos Φ

( i^j^ + i^k^ + j^j^ + j^k^ )

as we know

i ^* j ^= 1

j^ * j^ = 0

i^ * k^ = 0

j^ * k^ = 0

now putting values

( 1 + 0 + 0 + 0 ) cos Φ

cos Φ = - 1

cos Φ = 180•