Solve the equation

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

Problem

Solve the equation 2cos⁡2θ−5cos⁡θ+2=02 \cos 2\theta - 5 \cos \theta + 2 = 0, where π≤θ≤2π\pi \le \theta \le 2\pi.

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