![]() Sin The sin of an angle A is the ratio of lengths of the perpendicular to the hypotenuse. ![]() The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse), and the cosine is the ratio of the length of the adjacent leg to that of the hypotenuse. Sine, Cosine, and Tangent also called sin, cos and tan respectively are the most commonly used trigonometric ratios, the other 3 are the reciprocal of these. no matter how big or small the triangle is. ![]() In mathematics, sine and cosine are trigonometric functions of an angle. Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: For a given angle each ratio stays the same.
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