def cos(data=None, out=None, name=None, **kwargs):
    """Computes the element-wise cosine of the input array.

    The input should be in radians (:math:`2\\pi` rad equals 360 degrees).

    .. math::
       cos([0, \\pi/4, \\pi/2]) = [1, 0.707, 0]

    The storage type of ``cos`` output is always dense



    Defined in src/operator/tensor/elemwise_unary_op_trig.cc:L90

    Parameters
    ----------
    data : NDArray
        The input array.

    out : NDArray, optional
        The output NDArray to hold the result.

    Returns
    -------
    out : NDArray or list of NDArrays
        The output of this function.
    """
    return 0,
