If \(2 \cos 2 \theta=-\cos \theta\) and \(0<\theta<180^{\circ}\), then \(\theta\) is ____________ - SchoolNGR

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If \(2 \cos 2 \theta=-\cos \theta\) and \(0<\theta<180^{\circ}\), then \(\theta\) ...

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Mathematics

If \(2 \cos 2 \theta=-\cos \theta\) and \(0<\theta<180^{\circ}\), then \(\theta\) is ____________

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Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE

A \(90^{\circ}\) or \(120^{\circ}\)
B \(60^{\circ}\) or \(90^{\circ}\)
C \(60^{\circ}\) or \(120^{\circ}\)
D \(30^{\circ}\) or \(150^{\circ}\)

Correct Answer: Option A

Explanation:

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