Note that the purpose of engaging in these exercises is to facilitate your understanding in the first place, and it follows that you're doing exercises from a textbook in order to understand the concepts specifically being elaborated by that textbook.
If you use Claude, you can follow and understand its reasoning fully, but the thing you're trying to verify is if that reasoning is itself correct, and consistent with the methods or reasoning you're trying to understand from the textbook.
If you want to rely on Claude to learn things directly without other sources, that's perfectly acceptable, but if you're trying to learn from another source, then it's necessary for that source to convey everything necessary to do so.
If you use Claude, you can follow and understand its reasoning fully, but the thing you're trying to verify is if that reasoning is itself correct, and consistent with the methods or reasoning you're trying to understand from the textbook.
If you want to rely on Claude to learn things directly without other sources, that's perfectly acceptable, but if you're trying to learn from another source, then it's necessary for that source to convey everything necessary to do so.