Okay, so I want to brush up on my trig before I enter another course and I've got a stack of stuff that should help me.
However, I don't know what type of quality it is (library books), but I'm wondering no matter what time it comes from or how old it is or what it is...
What are good books, good math book writers, good places to use on the Internet to get a solid foundation of Trigonometry?


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