My Cal2 professor assigns problems in the book that do not have the answers in the back. The point of the homework is to learn how to do the problem. If you think you are doing the problem correctly, but are in fact doing it incorrectly, you will only fail the test. I use tools like integral calculator to compare my answer with the right answer to help me figure out what I'm doing wrong. You can't really use these tools for cheating because, in my experience, math teachers give no credit if you don't show your work.

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