Two forces F1 and F2 are acting on a body. One force is double that of the other force and the resultant is equal to the greater force. Then the angle between the two forces is -
(a) [tex]cos^{-1}(\dfrac{1}{2})[/tex]
(b) [tex]cos^{-1}(\dfrac{-1}{2})[/tex]
(c) [tex]cos^{-1}(\dfrac{-1}{4})[/tex]
(d) [tex]cos^{-1}(\dfrac{1}{4})[/tex]
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