What Is Cos Pi/2

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$Prove that \sin \frac{8\pi}{3} \cos \frac{23\pi}{6} + \cos \frac{13\pi$

Prove that \sin \frac{8\pi}{3} \cos \frac{23\pi}{6} + \cos \frac{13\pi

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How do you find the exact value of cos (pi)/2? | Socratic

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$Prove that \sin \frac{8\pi}{3} \cos \frac{23\pi}{6} + \cos \frac{13\pi$

Prove that \sin \frac{8\pi}{3} \cos \frac{23\pi}{6} + \cos \frac{13\pi

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