Find the exact values of:

MATHEMATICS · Multi-part · A Level · Mathematics · Trigonometry · Trigonometry

Problem

Find the exact values of: (1) cos⁡2π3\cos\frac{2\pi}{3}, sin⁡2π3\sin\frac{2\pi}{3}, and tan⁡2π3\tan\frac{2\pi}{3} (2) cos⁡(−π4)\cos\left(-\frac{\pi}{4}\right), sin⁡(−π4)\sin\left(-\frac{\pi}{4}\right), and tan⁡(−π4)\tan\left(-\frac{\pi}{4}\right)

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