The magnitude of the sum of two vectors $\vec{A}$ and $\vec{B}$ with $\theta$ as the angle between them is:

  • 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
    $\sqrt{A^2 + B^2 + 2AB \sin \theta}$

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