def arccos(a):
'''Inverse cosine of input'''
return _maths.arccos(a)
def arccos(a):
"""Inverse cosine of input"""
return _maths.arccos(a)
def arccos(a):
'''Inverse cosine of input'''
return _maths.arccos(a)
def arccos(a):
"""Inverse cosine of input"""
return _maths.arccos(a)