example02_variant.mifun

a = 0.1
b = 9

def Weistrass(x):
    if type(x) not in [int, float]:
        raise ValueError(f"Value out of domain: Reals")
    result = 0
    for n in range(3):
        result += math.cos(x * (b ** n * math.pi)) * (a ** n)
    return result