If vec(P) + vec(Q) = vec(R) and vec(P) - vec(Q) = vec(S), then R^(2) + S^(2) is equal to

If vec(P) + vec(Q) = vec(R) and vec(P) - vec(Q) = vec(S), then R^(2) +

1.	If vec(P) + vec(Q) = vec(R) and vec(P) - vec(Q) = vec(S), then R^(2) + S^(2) is equal to
Answer» <P>`P^(2) + Q^(2)` `2(P^(2) -Q^(2))` `2(P^(2) + Q^(2))` 4 PQ Answer :C