Sine | Definition, Formulas, & Facts | Britannica
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WEBsine, one of the six trigonometric functions, which, in a right triangle ABC, for an angle A, is sin A = length of side opposite angle A / length of hypotenuse. (The other five trigonometric functions are cosine [cos], tangent [tan], secant [sec], cosecant [csc], and cotangent [cot].)
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