Use a unit circle diagram to show that for .

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

Problem

Use a unit circle diagram to show that cos⁡(π2+θ)=−sin⁡θ\cos(\frac{\pi}{2} + \theta) = -\sin \theta for π2<θ<π\frac{\pi}{2} < \theta < \pi .

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