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Trigonometric functions of an angle
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In mathematics, sine and cosine are trigonometric functions. The sine and cosine of an acute angle are defined in the context of a right triangle: the sine of an acute angle of a right triangle is the ratio of the length of the side opposite that angle to the length of the longest side of the triangle, the hypotenuse; the cosine is the ratio of the length of the adjacent side to that of the hypotenuse.
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Résumé et adapté de l’article « Sine and cosine », Wikipédia en anglais. Licence CC BY-SA 4.0.
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