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Special values commonly used in mathematics
................0 30 45 60 90

Sine 0 1/2 √2/2 √3/2 1

Cosine 1 √3/2 √2/2 1/2 0

Tangent value 0 √3/3 1 √3 ∞

Taking sine as an example, the five values are root number 0, 1, 2, 3 and 4 respectively.

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