In mathematics, a sine is a trigonometric function that relates the angle of a triangle to the ratio of the opposite side to the hypotenuse. It is often written as sin(θ) and is used in geometry, physics, and engineering.
“Sine” comes from Latin “sinus,” meaning bay or fold, but that is actually a mistranslation of an Arabic word “jiba,” which itself came from a Sanskrit term for chord. Medieval translators misread the Arabic and chose “sinus,” and the name stuck. It’s a famous example of a mathematical term born from a chain of translation errors.
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