1.

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.        \[\sqrt{{{A}^{2}}+{{B}^{2}}+2AB\sin \theta }\]
Answer» B. \[\sqrt{{{A}^{2}}-{{B}^{2}}+2AB\cos \theta }\]


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