In a right triangle, it is defined as the ratio of opposite divided by hypotenuse.
This function's namesake law relates the side length to the opposite angle in any triangle. Its value is one at 90 degrees but negative one at 270 degrees. Its reciprocal is the cosecant function. In a right triangle, it is defined as the ratio of opposite divided by hypotenuse. For 10 points, name this trigonometric function that is not the tangent or cosine.
This function's namesake law relates the side length to the opposite angle in any triangle.
{sine}