The resultant of two forces P and Q acting at an angle θ, is given by:

• A. \(\sqrt {{P^2} + {Q^2} + 2PQ\tan \theta }\)
• B. \(\sqrt {{P^2} + {Q^2} + 2PQ\sin \theta }\)
• C. \(\sqrt {{P^2} + {Q^2} + 2PQ\cos \theta }\)
• D. P + Q + 2PQ tan θ