Use trigonometric identities to solve \( \cos (2 \theta)+\cos (\theta)=0 \) exactly for \( 0^{\circ} \leq \theta<360^{\circ} \). If there is more than one answer, enter your answers as a comma separated list.
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Use trigonometric identities to solve cos(2θ) − cos(θ) = 0 exactly for 0° ≤ θ < 360°. If there is more than one answer, enter your answers as a comma separated list.
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