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In trigonometry, the law of sines, sine law, sine formula, or sine rule is an equation relating the lengths of the sides of any triangle to the sines of its angles. According to the law, = = =, where a, b, and c are the lengths of the sides of a triangle, and α, β, and γ are the opposite angles (see figure 2), while R is the radius of the triangle's circumcircle.
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The introduction mentions the triangle problem of determining a triangle from 1 side length and 2 angles, and refers to an ambiguous case. This ambiguous case is later addressed right after the proof -- I understand this may be important for math homework (but it's really not relevant for this article). However, the section on "the ambiguous ...
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The Project Mathematics! series of videos is a teaching aid for teachers to help students understand the basics of geometry and trigonometry.The series was developed by Tom M. Apostol and James F. Blinn, both from the California Institute of Technology.
The law of sines (also known as the "sine rule") for an arbitrary triangle states: [85] = = = =, where is the area of the triangle and R is the radius of the circumscribed circle of the triangle:
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In mathematics, sine and cosine are trigonometric functions of an angle.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 ...