સદિશ $\overrightarrow{A}$ અને પરિણામી સદિશ $(\overrightarrow{A}-\overrightarrow{B})$ વચ્ચેનો ખૂણો $\beta$ નીચે મુજબ છે:

• A
  $\tan^{-1}\left(\frac{-B/2}{A-B\sqrt{3}/2}\right)$
• B
  $\tan^{-1}\left(\frac{A}{0.7B}\right)$
• C
  $\tan^{-1}\left(\frac{B\sin 120^{\circ}}{A+B\cos 120^{\circ}}\right)$
• D
  $\tan^{-1}\left(\frac{B\cos \theta}{A-B\sin \theta}\right)$