human
Can you provide a the Python code you requested given the following:
Complete the below
def TR16(rv, max=4, pow=False):

    ''''Convert cos(x)*-2 to 1 + tan(x)**2.
    See _TR56 docstring for advanced use of ``max`` and ``pow``.
    Examples
    >>> from sympy.simplify.fu import TR16
    >>> from sympy.abc import x
    >>> from sympy import cos, sin
    >>> TR16(1 - 1/cos(x)**2)
    -tan(x)**2'
    '''
assistant
#Here is the Python code you requested.
    def f(rv):
        if (not (isinstance(rv, Pow) and (rv.base.func is cos))):
            return rv
        ia = (1 / rv)
        a = _TR56(ia, cos, tan, (lambda x: (1 + x)), max=max, pow=pow)
        if (a != ia):
            rv = a
        return rv
    return bottom_up(rv, f)