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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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For example, the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse. The six trigonometric functions are defined for every real number , except, for some of them, for angles that differ from 0 by a multiple of the right angle (90°).
To find an unknown angle, the law of cosines is safer than the law of sines. The reason is that the value of sine for the angle of the triangle does not uniquely determine this angle. For example, if sin β = 0.5 , the angle β can equal either 30° or 150°.
The two Iraqis may have been innocent civilians. The Marines may have been obeying the strict rules of engagement, which govern when deadly force can be used (normally, in cases where the approaching car is a threat to American life and the driver refuses several warning signals to stop). But the damage was still done.