Question

if you answer me with explanation I will follow you​

Answer 1

Answer:

A+B

Explanation:

r= root of (A^2+B^2-2ABcos180°)

=root of (A^2+B^2-2AB(-1) )

=root of (A^2+B^2+2AB)

=root of [(A+B)^2]

=A+B

HOPE IT HELPS

MARK AS BRAINLIEST