function coversinf( x ) {
	return f32( f32( 1.0 ) - sinf( f32( x ) ) );
}
Computes the coversed sine of a single-precision floating-point number (in radians).

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

@example
var v = coversinf( 0.0 );
// returns 1.0

@example
var v = coversinf( 3.141592653589793/2.0 );
// returns 0.0

@example
var v = coversinf( -3.141592653589793/6.0 );
// returns 1.5

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