






def 						SCREAMING_SNAKE_CASE				(   __lowerCAmelCase   ,       __lowerCAmelCase     )					->      Optional[int]:

     if density <= 0:
          raise ValueError("Impossible fluid density"     )
     if bulk_modulus <= 0:
          raise ValueError("Impossible bulk modulus"     )

     return (bulk_modulus / density) ** 0.5


if __name__ == "__main__":
 import doctest

 doctest.testmod()







import numpy as np





def 		__UpperCAmelCase     (	a_):
							return 1 / (1 + np.exp(-vector))


if __name__ == "__main__":
	import doctest

	doctest.testmod()





