Two forces, ${F_1}$ and ${F_2}$ 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

    ${\cos ^{ - 1}}(1/2)$

  • B

    ${\cos ^{ - 1}}( - 1/2)$

  • C

    ${\cos ^{ - 1}}( - 1/4)$

  • D

    ${\cos ^{ - 1}}(1/4)$

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