def cos_1(a=1):
    r"""Fourier cosine transform pair cos_1 ([Ande75]_)."""

    def lhs(x):
        return np.exp(-a**2*x**2)

    def rhs(b):
        return np.sqrt(np.pi)*np.exp(-b**2/(4*a**2))/(2*a)

    return Ghosh('cos', lhs, rhs)
def cos_1 ( a = 1 ) : def lhs ( x ) : return np . exp ( - a ** 2 * x ** 2 ) def rhs ( b ) : return np . sqrt ( np . pi ) * np . exp ( - b ** 2 / ( 4 * a ** 2 ) ) / ( 2 * a ) return Ghosh ( 'cos' , lhs , rhs )
r"""Fourier cosine transform pair cos_1 ([Ande75]_).