code: @Pure
  	@Inline(value = "1.-Math.cos($1)", imported = {Math.class})
  	public static double versin(double angle) {
  		return 1. - Math.cos(angle);
  	}
docs: Replies the versine of the specified angle.
  
  <p><code>versin(a) = 1 - cos(a)</code>
  
  <p><img src="./doc-files/trigo1.png" alt="[Versine function]">
  
  @param angle the angle.
  @return the versine of the angle.