Niven's theorem limits the cases for which the input and output of this function are both rational.
Niven's theorem limits the cases for which the input and output of this function are both rational. The graph of this function of r in polar coordinates is centered at the Cartesian point zero comma one-half, and is a circle with its lowest point at the origin. This function also gives the imaginary component of a complex exponential function. The law named for this function is helpful to find an unknown side length of a triangle given one side length and the angles opposite those two sides. It is equal to plus or minus the square root of the quantity one minus cosine squared of x, and it gives the y-coordinate of points on the unit circle. Name this function that in right triangles is expressed as  "opposite over hypotenuse".
Niven's theorem limits the cases for which the input and output of this function are both rational.
sine function [accept sine (of) x, where “x” is any Greek, Roman, or other letter]