We tried this experiment with humans, back in the 17th century, and only a few[1] out of millions managed it given a whole human lifetime each.
[1] Obviously Newton counts as one. Leibniz like Newton figured out calculus. Other people did important work in dynamics though no one else's was as impressive as Newton's. But the vast majority of human-level intelligences trained on texts prior to Newton did not create calculus or derive the equations of motion or come close to doing either of those things.
Newton did it at 23 and there would have been very few people with mathematical training. The LLM would be trained on the entirety of recorded human knowledge and mathematics up to that point, and would get to use a lot more energy so it still has a massive material advantage over young Isaac. Yet I don't believe calculus would magically appear in its response.