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Mathematics, 18.12.2020 19:10 1129682

What is the exact value of Cosine (StartFraction 7 pi Over 8 EndFraction)? Negative StartFraction StartStartRoot 2 minus StartRoot 2 EndRoot EndEndRoot Over 4 EndFraction

Negative StartFraction StartStartRoot 2 minus StartRoot 2 EndRoot EndEndRoot Over 2 EndFraction
Negative StartFraction StartStartRoot 2 + StartRoot 2 EndRoot EndEndRoot Over 2 EndFraction

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