Ratio between the lengths of the opposite side and the hypotenuse in a right triangle.
1
Also, Dan's data seems to be a sort of a sine function.
2
Effective lever arm varied almost as a sine function, with optimal lever arm at 90 degrees of flexion.
3
Hence the laws of periodic alternate currents following the sine function of the time fail when we come to consider microphones and telephones.
4
They do not follow the constant periodic law, and they are not true harmonic sine functions of the time.