import cmath


def f_2(z):
    return z**2


def f_3(z):
    return z**3


def f_4(z):
    return z**4


def f_5(z):
    return z**5


def f_zsinz(z):
    return cmath.sin(z) * z


def f_sin_cos(z):
    return cmath.sin(z) * cmath.cos(z)


def f_tg_z(z):
    return cmath.tan(z)

