Evaluate the following: \( \cos \frac{2 \pi}{3} \cos \frac{\pi}{4}-\sin \frac{2 \pi}{3} \sin \fr...

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Evaluate the following: \( \cos \frac{2 \pi}{3} \cos \frac{\pi}{4}-\sin \frac{2 \pi}{3} \sin \frac{\pi}{4} \)
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