function str$7(a) {
    return 'quat2(' + a[0] + ', ' + a[1] + ', ' + a[2] + ', ' + a[3] + ', ' + a[4] + ', ' + a[5] + ', ' + a[6] + ', ' + a[7] + ')';
  }
Returns a string representation of a dual quatenion

@param {quat2} a dual quaternion to represent as a string
@returns {String} string representation of the dual quat