Niven's theorem

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Notion

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Science and technology

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What Wikipedia says

In mathematics, Niven's theorem, named after Ivan Niven, states that the only rational values of θ in the interval 0° ≤ θ ≤ 90° for which the sine of θ degrees is also a rational number are:

Excerpt from the Wikipedia article “Niven's theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia