If `vec(A)=vec(B)+vec(C)` and the magnitude of `vec(A), vec(B) and vec(C)` are 5, 4, and 3 units respectively the angle between `vec(A) and vec(B)` is :

Options

A. `cos^(-1) (3//5)`
B. `cos^(-1) (4//5)`
C. `pi//2`
D. `sin^(-1) (3//4)`

Answer

A

Explanation

`tan. theta = (4)/(3)`