from typing import Any
from sympy.core.relational import Equality, Ne, Relational
from sympy.functions.special.delta_functions import DiracDelta, Heaviside
from sympy.series.order import Order
def change_mul(node, x) -> tuple[None, Any | Order | None] | tuple[DiracDelta, Any | Order]:
    ...

def deltaintegrate(f, x) -> Heaviside | Equality | Relational | Ne | None:
    ...

