function csc( x ) {
	return 1.0 / sin( x );
}
Evaluates the cosecant of a number.

@param {number} x - input value (in radians)
@returns {number} cosecant

@example
var v = csc( 0.0 );
// returns Infinity

@example
var v = csc( 3.141592653589793/2.0 );
// returns 1.0

@example
var v = csc( -3.141592653589793/6.0 );
// returns ~-2.0

@example
var v = csc( 3.141592653589793/6.0 );
// returns ~2.0

@example
var v = csc( NaN );
// returns NaN