Explain how to use the unit circle to find when

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

Problem

Explain how to use the unit circle to find θ\theta when cos⁡θ=−sin⁡θ\cos\theta=-\sin\theta, where 0≤θ≤2π0\leq\theta\leq2\pi.

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