why do I need random.setstate in this case?

This is an assignment of a class.

gradcheck_naive(quad, np.random.randn(3,))

The picture is about the function above.

enter image description here

I have simplified the code.

I know the meaning of random.getstate() and random.setstate(state).

But I don't know why I need to call them in this case: the value of x has been passed in and there is no other place where I use a random value in this function.