Question

Can someone help me out with this question
bh step by step procedure? ​

Answer 1

cos θ= 60°

Explanation:

cos θ= a . b/।a। ।b।

=15/2/3×5

=15/30

=1/2

cos θ=cos60°

θ=60

Answer 2

60°

Explanation:

the angle Θ between vectors a and b is

cosΘ =
`(a.b)/(|a||b|)` =
`((15)/(2) )/(3(5))` =
`((15)/(2) )/(15)` =
`(1)/(2)` , then

Θ =
`cos^(-1)` (
`(1)/(2)` ) = 60°