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What is the exact value of cos 4/3 pi
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What is the exact value of cos 4/3 pi

User Nirazlatu
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The exact value of cos(43)cos43 cannot be found using sum and difference formulas or half-angle identities. The approximate decimal answer is 0.235237570.23523757.
User Rosabel
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cos 4/3π = cos (π + π/3) = -cos π/3 = -0.5
User Nicolas Bousquet
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