def _sinch(x):
 x2 = (x * x)
 if (abs(x) < 0.0135):
  return (1 + ((x2 / 6.0) * (1 + ((x2 / 20.0) * (1 + (x2 / 42.0))))))
 else:
  return (np.sinh(x) / x)

def _sinch ( x ) : x2 = ( x * x ) if ( abs ( x ) < 0.0135 ) : return ( 1 + ( ( x2 / 6.0 ) * ( 1 + ( ( x2 / 20.0 ) * ( 1 + ( x2 / 42.0 ) ) ) ) ) ) else : return ( np . sinh ( x ) / x )
stably evaluate sinch .