question_answer

The value of the sum of two vectors \[\overrightarrow{A}\] and \[\overrightarrow{B}\] with \[\theta \] as the angle between them is                                             [BHU 1996]

A)                 \[\sqrt{{{A}^{2}}+{{B}^{2}}+2AB\cos \theta }\]

B)                             \[\sqrt{{{A}^{2}}-{{B}^{2}}+2AB\cos \theta }\]

C)                 \[\sqrt{{{A}^{2}}+{{B}^{2}}-2AB\sin \theta }\]    

D)                 \[\sqrt{{{A}^{2}}+{{B}^{2}}+2AB\sin \theta }\]