When the angle between two vectors of equal magnitudes is 2/3, prove that the magnitude of the resultant is equal to either.

When the angle between two vectors of equal magnitudes is 2/3, prove t

1.	When the angle between two vectors of equal magnitudes is 2/3, prove that the magnitude of the resultant is equal to either.
Answer» Solution :`R=(P^(2)+Q^(2)+2PQcostheta)^(1//2)=(p^(2)+p^(2)+2P.pcos""(2PI)/(3))^(1//2)=[2p^(2)+2p^(2)((-1)/(2))]^(1//2)=p`