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Compare cosine(pi/2+x),sin(pi/2+x),cos(pi+x),sin(pi+x) with sinx and Prove that \sin \frac{8\pi}{3} \cos \frac{23\pi}{6} + \cos \frac{13\pi The number pi (3.14159)
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Pi - EnchantedLearning.com
Prove that \sin \frac{8\pi}{3} \cos \frac{23\pi}{6} + \cos \frac{13\pi