SubArea: Trigonometric equations and inequalitiesLevel: CProject ID: 1003086003Accepted: 1Clonable: 0Easy: 0The sum of all \( x\in\left[0^{\circ};360^{\circ}\right] \) satisfying the equation \( \cos 2x = \cos x \) is:\( 720^{\circ} \)\( 360^{\circ} \)\( 480^{\circ} \)\( 120^{\circ} \)
