Solve for in the interval : 3 = 12.

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

Solve for θ\theta in the interval 0∘≤θ<120∘0^{\circ}\le \theta<120^{\circ}: cos⁡3θ=12.\cos 3\theta = \frac12.

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