sine - What does it mean?

Usage notes

In various branches of mathematics, the sine of an angle is determined in various ways, including the following: * The y''-coordinate]] of the point on the unit circle at the given anticlockwise angle from the [[x-axis|''x -axis. * The sum of the real or complex power series

     $\backslash sum\_\{n=1\}^\backslash inftyx^\{2n-1\}\; =\; x\; -\; \{1\backslash over\; 6\}\; x^3\; +\; \{1\backslash over\; 120\}\; x^5\; -\; \{1\backslash over\; 5040\}\; x^7\; +\; ...$

where x is in radians.