The resultant of two forces P & Q are acting at an angle θ is equal to-
1
\(\sqrt {{P^{^2}} + {Q^2} + 2PQ\sin \theta } \)
2
\(\sqrt {{P^{^2}} + {Q^2} + 2PQ\cos \theta } \)
3
\(\sqrt {{P^{^2}} + {Q^2} - 2PQ\sin \theta } \)
4
\(\sqrt {{P^{^2}} + {Q^2} - 2PQ\cos \theta } \)