Diamond Enthusiast

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It depends on the class and on the person.
Sometime the books make up for a weakness in either the required books or the professor.
Sometimes they teach the topic in a different way. Since we all think differently, this may help some people who think a certain way, but may be useless to others.
Sometimes they simply reinforce the required texts and the professor (this is especially the case with workbook-type texts). This is useful if you're struggling.
The best way to find out is to ask someone who has taken the class and/or the professor. If you don't know anyone who has taken the class and the professor isn't helpful, it's a bit harder. I'd get it if it's cheap or if you think you'll be struggling. Otherwise, you may want to wait and buy it (or not) once you've gotten a feeel for the class.
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